Hull KR half-back Michael Dobson will be out for a month after being injured in the win over Wakefield Trinity.
Dobson suffered shoulder damage in the first half of the game and was taken off as a precaution.
Coach Craig Sandercock told the club website the injury required 'nothing more than conservative management'.
Dobson joins other key Rovers players currently on the sidelines, including Australian forward and club captain Ben Galea and half-back Blake Green.
Sandercock said: "Being without Michael makes life tough for us, especially with the other injuries that we have, but I've always said that these kind of problems present opportunities for others and we'll just get on with the job."