Molhoek previously played several years for
Dordrecht '90,
RKC Waalwijk,
AZ,
Vitesse and
VVV-Venlo. He had emerged as a talented
defensive midfielder at RKC, and was signed by AZ in January 2006 on a four-and-a-half-year contract in a move, which saw
Danny Mathijssen move the other way on loan. His time in
Alkmaar was, however, marked by injuries and he struggled to establish himself in the starting lineup. After loans at NAC Breda and Vitesse, he signed a permanent two-and-a-half-year deal with the latter on 14 January 2009 with
Julian Jenner making the same move. Molhoek signed his last professional contract with
FC Dordrecht in July 2012. On 8 April 2013, Molhoek announced his retirement from professional football, returning to his youth club SHO in his hometown
Oud-Beijerland, after the season. Due to a lingering ankle injury, Molhoek was no longer able to continue playing professionally. He would also join the coaching staff of the youth department of Dordrecht. He retired from SHO in early 2015 due to injuries. ==International career==