Klaudijus Upstas (born 30 October 1994) is a Lithuanian footballer who plays as a midfielder for FK Žalgiris.
He made his A Lyga debut in 2013 with FK Tauras Tauragė. Up to 2020 he was a journeyman footballer around Lithuania, before settling in FC Hegelmann.
He played six straight seasons for Hegelmann and became team captain. He first helped the club win promotion to the highest league, then helped the team reach cup finals, become runners-up in the league; he also got his first experience in continental club competition. Inn 2026 he moved on to FK Žalgiris.
Upstas made his senior international debut for Lithuania during the 2022 Baltic Cup. In 2025 Upstas and Lithuania faced the Netherlands home and away.
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