He is on the books of Viktoria Aschaffenburg and wears shirt number 8. His main role on the pitch is Forward. His stronger foot is Right. His estimated market valuation currently stands at 75K €.

His latest transfer saw him join Viktoria Aschaffenburg from Rot-Weiss Erfurt via on 2026-01-26.

During the German Regionalliga 2025-2026 campaign, L. Kleiner made 7 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.