He currently plays for Viktoria Aschaffenburg, wearing the number 8 shirt. He plays primarily as a Forward. His preferred foot is Right. His current market value is estimated at 50K €.

His most recent move was a from Rot-Weiss Erfurt to Viktoria Aschaffenburg on 2026-01-25.

In the German Regionalliga 2025-2026 season, L. Kleiner scored 0 goals and provided 0 assists across 7 appearances, averaging 0 goals per game with 0 shots attempted and 0 on target.