Hull KR could have lost full-back Adam Quinlan for the rest of the season, after he was injured in the defeat against Wakefield.
Quinlan, 26, has scored six tries in nine games since making his long-awaited return from injury against Warrington in June.
Coach Tony Smith said in his post-match press conference: “It’s an abductor issue, whether he’s torn it off the bone, which sounds bad but apparently that’s the better of the two injuries.
“If he hasn’t torn it off the bone and just torn it slightly and it’s still attached, that will be him done for the rest of the season.
“He’s having that scanned in the morning so we’ll know a lot more then. If it’s the best scenario he’ll probably miss a few games anyway, one or two.”