The 2018–19 season was Futbol Club Barcelona's 119th season in existence and the club's 88th consecutive season in the top flight of Spanish football. Barcelona was involved in four competitions after winning the double of La Liga and the Copa del Rey in the previous season.
Contrary to the expectations and primarily due to stellar Lionel Messi performances, Barcelona were in the running for a third continental treble, until 7 May 2019, when they infamously lost 4–0 to eventual winners Liverpool in the second leg of the Champions League semi-finals, having been up 3–0 after the first game. The league title was secured earlier on 27 April and Barça advanced to its sixth consecutive Copa del Rey final on 27 February . The loss at Anfield derailed the team and they went on to lose the Copa del Rey final as well, to Valencia. Barça's league title was its eighth in eleven seasons; their next league title would be won in 2022–23. Head coach Ernesto Valverde was sacked midway through the next season.
The season was the first since 2001–02 season without former captain Andrés Iniesta, who departed to join Vissel Kobe.
Season overview June On 3 June, Barcelona and defender Samuel Umtiti reached an agreement to extend the player's contract for a further five seasons through to 2022–23 with a release clause of €500 million.
On 11 June, Barcelona reached an agreement with Watford for the transfer of Gerard Deulofeu for €13 million plus €4 million in variables. Barcelona will also receive a percentage of any future transfer fee.
July On 8 July, Barcelona announced that they had reached an agreement with Guangzhou Evergrande for the loan transfer of Paulinho for one season, with a subsequent purchase option for the Chinese club.
On 9 July, Barcelona and Grêmio finalized the transfer of Arthur following the agreement the two clubs reached in March for a transfer fee of €31 million plus €9 million in variables. The player will sign a contract for the next six seasons and the buyout clause is set at €400 million.
On 12 July, Barcelona announced that they had paid the buyout clause for Clément Lenglet which stood at €35.9 million. The player, who joined from Sevilla, signed a contract with the club for the next five seasons and the buyout clause is set at €300 million.
On 23 July, Barcelona announced that they had reached an agreement with Sivasspor for the loan transfer of Douglas for one season.
On 23 July, Barcelona announced that they had reached an agreement with Deportivo La Coruña for the loan transfer of Adrián Ortolá for one season, with a subsequent purchase option for the A Coruña club.
On 24 July, Barcelona announced that they had reached an agreement with Bordeaux for the transfer of Malcom for a transfer fee of €41 million plus €1 million in variables. The player signed a contract for the next five seasons until the end of 2022–23.
August
On 1 August, Barcelona and Everton reached an agreement for the transfer of Lucas Digne to the English club for an initial fee of €20.2 million and €1.5 million in variables.
On 3 August, Barcelona announced that they had reached an agreement with Bayern Munich for the transfer of Arturo Vidal to the Catalan club for the next three seasons for a fee of €18 million.
On 4 August, Barcelona and Sevilla reached an agreement for the transfer of Aleix Vidal to the Andalusian club for a transfer fee of €8.5 million, plus €2 million in variables.
On 9 August, Barcelona and Everton reached an agreement for the transfer of Yerry Mina for a fee of €30.25 million with an additional €1.5 million in variables. Barcelona also negotiated a buy-back clause in the transfer. Additionally, André Gomes was loaned to Everton for the 2018–19 season. The English club agreed to pay a fee of €2.25 million for the single season.
On 12 August, Barcelona defeated Sevilla 1–2 in the Spanish Super Cup at the Stade Ibn Batouta in Morocco; goals from Gerard Piqué and Ousmane Dembélé handed the Catalans their 13th Supercopa de España title. The trophy was the first won under the captaincy of Lionel Messi, who also claimed his record-breaking 33rd trophy with the club. Additionally, the match saw official debuts from Arthur, Lenglet, and Arturo Vidal.
On 16 August, Barcelona announced that they had reached an agreement for the transfer of Marlon to the Italian club Sassuolo for an initial fee of €6 million, including a buy-back clause for the Catalans. Barcelona will receive additional €6 million if Marlon makes 50 appearances for Sassuolo. If he would be sold before that, Barcelona will receive 50% of the future transfer fee.
On 18 August, Barcelona defeated Alavés 3–0 with two goals from Messi, including the 6,000th La Liga goal in the club's history, and one from Coutinho to secure Barça an opening day victory for a tenth successive season.
On 25 August, Barcelona defeated Real Valladolid 0–1, Barça made it two wins out of two thanks to a goal from Dembélé. The match also saw an official debut from Malcom.
September On 2 September, Barcelona demolished newly promoted Huesca 8–2. A sensational Messi who scored 2 goals had the chance to get his hat-trick with a final minute penalty, but chose to be generous and gave the chance to Suárez who scored his 2nd goal of the game. Dembélé, Ivan Rakitić, Jordi Alba were also on the scoresheet, along with an own goal from Jorge Pulido.
On 15 September, Barcelona defeated Real Sociedad 1–2. Despite trailing at half time, goals from Suárez and Dembélé turned things around to make it four wins out of four in La Liga.
On 18 September, Barcelona beat PSV Eindhoven 4–0 in their first Champions League game of the season. Another great performance of Messi as he managed his record-breaking 8th Champions League hat-trick and Dembélé notched the remaining goal from a solo effort to complete another victory for the Blaugrana side.
On 23 September, Barcelona draw Girona 2–2. Sending off for Lenglet hinders home side, Messi and Piqué found the net for the Blaugrana.
On 26 September, Barcelona lost to Leganés 2–1. Coutinho's opener counts for nothing as top against bottom clash took unexpected twist with two goals in a minute.
On 29 September, Barcelona draw Athletic Bilbao 1–1. Substitutes Messi and Munir came to the rescue to salvage a draw at Camp Nou after Basques had taken 41st-minute lead
October On 3 October, Barcelona defeated Tottenham 2–4, with some major changes in the starting eleven introducing Arthur as a starter for the first time in midfield, the benching of Dembele and putting Coutinho back in attack with Messi and Suarez. Valverde's men secured an important victory in a classic, end-to-end match in London to maintain their perfect start in the Champions League group stage.
On 7 October, Barcelona drew with Valencia CF 1-1. Messi scored a beautiful equaliser after an early opener from Garay to earn the blaugranes a share of the spoils at Mestalla.
On 20 October, Barcelona defeated Sevilla 4-2. Four goals and a sensational performance by Ter Stegen allowed Barça to snatch first place back from the leaders on a night that Leo Messi went off injured.
On 24 October, Barcelona defeated Inter Milan 2-0. Rafinha and Jordi Alba's superb goals left the Catalans flying high in Champions League Group B with the maximum points at the halfway stage.
On 28 October, in the first El Clásico of the season, and the first since 2007 not to feature Messi or Cristiano Ronaldo, Barcelona thrashed Real Madrid 5–1 at the Camp Nou, with Luis Suárez scoring a hat-trick.
November On 3 November, Barca defeated Rayo Vallecano 2-3, two goals from Suárez and another from Ousmane Dembélé earned the Blaugranes a late win at Vallecas.
On 6 November, Barca draw Inter Milan 1-1, Malcom's 1st goal was not enough at the Giuseppe Meazza after the equalizing goal of Icardi, but Barça still made the knockout stages with two games in hand.
On 11 November, Barca lost 3-4 to Betis, The Andalusians spoiled Messi's return to action who scored 2 goals, with a shock victory in a dramatic encounter at the Camp Nou seeing Rakitic being sent off after picking his 2nd yellow card .
On 24 November, Barca draw Atlético Madrid 1-1, Diego Costa's late header at the Wanda Metropolitano was cancelled out by Ousmane Dembélé after a brilliant pass of Messi in the final minute of normal time.in addition both Sergi Roberto and rafinha got injured after the game against Atlético
On 28 November, Barca defeated PSV Eindhoven 1-2, Goals from a sensational Messi and Piqué clinched the points that ensure top spot in Champions League Group B with a game in hand.
December On 2 December, Barcelona defeated Villarreal 2-0 with goals from Gerard Piqué and Carles Aleñá, which ensured the win and a clean sheet against worthy opponents.
On 8 December, Barcelona defeated Espanyol 0-4 with two sensational free kicks from Leo Messi, plus goals from Dembélé and Luis Suárez which brought derby delight and another week at the top of the table.
On 11 December, Barcelona drew 1-1 with Tottenham producing a magnificent performance as Dembélé scored Barça's only goal.
On 16 December, Barcelona defeated Levante 0-5 playing sensational football which saw them power their way to victory in Valencia. Leo Messi scored yet another hat-trick with Luis Suárez and Gerard Piqué scoring the other goals.
On 20 December, Barcelona announced that they had reached an agreement with Valencia for the transfer of Jeison Murillo on loan for the remainder of the 2018/19 season. The agreement includes a purchase option worth €25m.
On 22 December, Barcelona defeated Celta Vigo 2-0 with goals from Leo Messi and Ousmane Dembele. The win ensured Barca remained on top of the table, three points ahead of Atletico Madrid, heading into the winter break.
January On 6 January, Barcelona defeated Getafe 1-2, goals from a sensational Leo Messi and a volley from Luis Suárez overcame a tough opponent and put the Barcelona five points clear at the top of the Liga table.
On 10 January, Barcelona lost to Levante 2-1 in Copa del Rey round of 16, Philippe Coutinho converted a penalty five minutes from the end.
On 13 January, Barcelona defeated Eibar 3-0, by 2 goals of Luis Suarez who was on fire with the first goal coming from a brilliant combination with a reborn Philipe Coutinho, the other goal being scored by none other than a sensational Leo Messi, which made it his record 400th La Liga goal.
On 17 January, Barcelona defeated Levante 3-0 in Copa del Rey round of 16 return game, by 2 goals of Ousmane Dembele and a goal of Leo Messi, this win made sure Barcelona qualified for the Copa del Rey quarter finals.
On 20 January, Barcelona defeated Leganés 3-1, as the first-place Catalans chew up the 'Cucumber Growers' at Camp Nou.
On 23 January, Barcelona lost to Sevilla 2-0 in the Copa del Rey quarterfinals. Juan Sarabia and Ben Yedder scored the goals for Sevilla.
On 23 January, Barcelona announced that they had reached an agreement with Ajax for the transfer of Frankie De Jong who will be joining the Catalan club from 1 July 2019. The transfer fee is 75 million euros, plus a further 11 million in variables. The player will be signing a contract for the next five seasons, through to 2023/24.
On 27 January, Barcelona won Girona 0-2. Nelson Semedo's first League goal and another Leo Messi special handed Barça all three points.
On 30 January, Barcelona won Sevilla 6-1 in the Copa del Rey quarterfinals 2nd leg. Phil Coutinho nets a brace, while Ivan Rakitic, Sergi Roberto, Luis Suárez and Leo Messi notch a goal each. the victory made sure Barcelona qualified for the semifinals of the Copa del Rey
February
On 1 February, the announcement was made that Barcelona would face Real Madrid in the semifinals of the Copa del Rey, in the second El Clásico of this season.