Ryan Wilson looks likely to miss Friday's match after being forced off in Saturday's disappointing defeat to Scarlets in South Wales.
A scan yesterday morning indicated that there is no fracture to his ribs but he is still in some pain.
Speaking at yesterday's open training session, defence coach Kenny Murray told The Scotsman: "There is obviously a bit of bruising and I'd say he is unlikely to be available this week, but you never know."
Hooker George Turner was also injured on Saturday, coming off early for a head injury assessment and not returning. "He passed the first stage of his return to play protocol today so if he gets through that then he could be good for Friday night," said Murray.
If Turner misses out, Warriors will be able to call on Fraser Brown who has recovered from an ankle injury picked up during the Six Nations. "Fraser did a good bit of contact at the end of the session and got through that so he should be back in consideration," said Murray.
Murray also revealed that centre Alex Dunbar is in line for a return to action. "He, for me, has been one of the standout players at training during the last month.
"His speed records have been up there through the roof and his aerobic capacity has really improved, so he's really raring to go.
"Expect to see a big game if he's involved this week," added Murray.