He is on the books of RB Leipzig U16 and wears shirt number 19. His main role on the pitch is Midfield. His stronger foot is Right.

His latest transfer saw him join RB Leipzig U17 from RB Leipzig Youth via on 2025-06-30.

Over 5 appearances in the Shanghai Future Star Cup 2025, Karl Hamella contributed 0 goals and 0 assists, completed 0 key passes from 0 total passes, and posted a passing accuracy of -.