Leeds half-back Rob Burrow is facing up to three months on the sidelines with a broken collarbone.
Burrow, 31, went off clutching his shoulder in the second half of the Rhinos 32-12 Challenge Cup victory over St Helens on Saturday.
Utilised at both scrum-half and hooker, Burrow has been an ever present this season, notching up his 400th Leeds appearance over the Easter period.
He missed just one of the Rhinos’ 33 matches in 2013.
With Papua New Guinea international Paul Aiton also on the sidelines through injury, captain Kevin Sinfield may take on the hooking role for Brian McDermott’s side, who face Wigan on Friday.