Warrington full-back Brett Hodgson will be out for at least two weeks after being told he needs minor knee surgery.
The 35-year-old limped out of the Wolves' 52-6 Challenge Cup win over Salford on Sunday and will now sit out Friday's Super League home game against Hull and the derby with St Helens at the Magic Weekend in Manchester.
"Brett's got some floating matter behind his knee that he'll need a tidy up on," said Warrington coach Tony Smith.
"It's a fairly minor situation for him but we'll miss him for the next couple of weeks."
In better news for Warrington, Adrian Morley is likely to make his comeback this weekend after recovering from a ruptured bicep.
Smith has yet to decide whether Morley's return will be for the Wolves against Hull or with partnership club Swinton in Sunday's Northern Rail Cup match against North Wales Crusaders, but says the club captain will be given a say in the discussions.
"Not all players get that benefit but he's our captain and our senior player," added Smith.
"He's been out for three months which is a significant time and we want to do the right thing by him.
"He'll be in our 19 for the Hull game and, if he doesn't make the field on Friday night, then he'll play on Sunday."