H. Vandermersch has quickly become a central player in FC St. Gallen's midfield. His tireless work rate and ability to influence the game in both directions make him an indispensable asset for the Espen. He is the engine that drives the team.

His strengths lie in both defense and offense. Vandermersch is known for his aggressive ball recoveries and his ability to thwart opposing attacks early. At the same time, he possesses the game intelligence to initiate attacks and control the pace of play.

Vandermersch's stamina is remarkable; he is present throughout the entire match and never shies away from a tackle. This constant presence in the center of the pitch allows St. Gallen to remain defensively compact while also transitioning quickly to offense.

With his vision and precise passes, H. Vandermersch is also an important building block in the team's build-up play. He can quickly shift the play and put his teammates in promising positions. His performances are a crucial factor in St. Gallen's tactical flexibility.