He currently plays for Willem II, wearing the number 83 shirt. He plays primarily as a Defender. His preferred foot is Right. His current market value is estimated at 500K €.

His most recent move was a from RWDM Brussels to Willem II on 2026-07-23.

Throughout the Belgian Cup 2025-2026, Mats Lemmens featured in 2 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.