He is on the books of Etoile Carouge and wears shirt number 20. At international level, he features for Switzerland U20. His main role on the pitch is Midfield. His stronger foot is Left. His estimated market valuation currently stands at 200K €.

His latest transfer saw him join Luzern from Etoile Carouge via Loan on 2026-06-30.

Over 16 appearances in the Switzerland Challenge League 2025-2026, Mattia walker contributed 0 goals and 0 assists, completed 0 key passes from 0 total passes, and posted a passing accuracy of -.