Kaj Sierhuis is a 28-year-old professional football player from NED. He currently plays for Fortuna Sittard, wearing the number 9 shirt. He plays primarily as a Forward. He stands at 180cm tall and weighs 80kg. His preferred foot is Both. His current market value is estimated at 1.8M €.

His most recent move was a Free from Stade DE Reims to Fortuna Sittard on 2023-08-01. The reported fee was 0.5M €.

In the Netherlands Eredivisie 2025-2026 season, Kaj Sierhuis scored 9 goals and provided 0 assists across 22 appearances, averaging 0.4 goals per game with 56 shots attempted and 23 on target.