He currently plays for RWDM Brussels, wearing the number 83 shirt. He plays primarily as a Defender. His current market value is estimated at 500K €.

His most recent move was a from Lecce to RWDM Brussels on 2025-07-01.

Throughout the Belgian Second Division 2025-2026, Mats Lemmens featured in 21 matches, averaging 1.4 tackles, 1.2 interceptions, and 4.6 clearances per game, while blocking 0.2 shots per game.