On 8 July 2016, Southampton confirmed that they had signed Klarer on a professional contract from Rapid Wien.[3] Klarer started for the club's U18 squad. In April 2019, he signed a new contract until the summer 2021.[4]
On 7 January 2020, Klarer joined Austrian club SKN St. Pölten on loan for the 2019–20 season.[5] In February, he made his debut on the match against Admira Wacker Mödling.
Fortuna Düsseldorf
On 5 October 2020, Klarer moved into German football with Fortuna Düsseldorf, newly relegated from the Bundesliga, on a contract until 30 June 2024.[6]
Darmstadt 98
On 18 July 2023, Klarer signed a four-year contract with newly promoted Bundesliga club Darmstadt 98.[7] Darmstadt got relegated again after one season.
Birmingham City
On 20 July 2024, a year after joining Darmstadt 98, Klarer returned to English football on a three-year contract with EFL League One club Birmingham City.[8] He was an unused substitute for the opening match of the league season, and made an "extremely comfortable" debut in the starting eleven for the next fixture, a 1–0 away to Charlton Athletic on 13 August.[9]
Career statistics
As of match played 11 January 2025
Appearances and goals by club, season and competition