László Kleinheisler (Hungarian: ; born 8 April 1994) is a Hungarian professional footballer who plays as a midfielder for Croatian football club Osijek.
Club career Videoton Having joined Hungarian club Videoton FC in 2013, he made his debut in the Hungarian first division on 28 July 2013 against Haladás, while also scoring his first league goal in an eventual 2–0 home win.
On 28 July 2013, he scored his first goal in the 2013–2014 season against Szombathelyi Haladás at the Sóstói Stadion, Székesfehérvár. The match ended with a 2–0 victory for Videoton FC. In the rest of the season he scored another three goals, one against Újpest FC at the Sóstói Stadion on 6 October 2013, one against Mezőkövesd-Zsóry SE in a 1–0 victory at the Sóstói Stadion on 8 November 2013, and the last goal against Diósgyőri VTK at the DVTK Stadion in a 2–2 draw match on 24 November 2013.
In the 2014–2015 season, he played only 370 minutes in 11 appearances for Videoton FC and 911 minutes in 12 appearances for Puskás Akadémia FC. In July 2015, Kleinheisler refused to sign the extension of his contract with Videoton, therefore he was ousted to the reserves for the 2015–2016 season. Videoton refused to sell him to the Ekstraklasa club Śląsk Wrocław in August.
Werder Bremen On 20 January 2016, Kleinheisler joined Werder Bremen on a 3.5-year contract for an undisclosed fee. He made his debut in the Bundesliga on 30 January 2016 against Hertha BSC in the Weserstadion. He was brought onto the pitch in the 62nd minute at 2–0 to Berlin and helped Bremen come back from 2–0 and 3–1 deficits to earn a 3–3 draw.
