He is on the books of FC Rosengard and wears shirt number 18. His main role on the pitch is Forward.

His latest transfer saw him join FC Rosengard from BK Olympic via on 2025-01-29.

During the Sweden Division 1 2025 campaign, Mattias andersson made 27 appearances, scoring 1 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.