He is on the books of Bremer SV and wears shirt number 2. His main role on the pitch is Defender. His estimated market valuation currently stands at 50K €.

His latest transfer saw him join Bremer SV from BSG Chemie Leipzig via on 2024-01-18.

Across the German Regionalliga 2025-2026, J. Gröger appeared in 21 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.