According to reports, Sierhuis signed with NEC transfervrij after a good season at Fortuna Sittard. However, his role in the team has been affected by Tadic's transfer. Sierhuis has a good relationship with Tadic, whom he considers a great player. He is unhappy with the situation and feels he's not getting the chance to play. In his first substitute appearance for NEC against Telstar, Sierhuis scored a goal, but he believes he needs to do more to secure his position. Rather than focusing on the competition for the striker spot, Sierhuis prefers to concentrate on his own performance. He scored a goal in his first substitute appearance for NEC against Telstar.