Ulster face an anxious wait to hear the extent of the injury suffered by Dan Tuohy against the Scarlets on Friday.
The second-row forward, making his first appearance for three weeks, limped out of Ravenhill with what appeared to be a recurrence of the same injury he suffered against Northampton in December - a torn calf muscle.
In the same match, centre Luke Marshall suffered damage to a finger and coach Mark Anscombe admitted: "It's not looking good for Dan.
"It's the same leg or calf injury so that's got to be a concern.
"Luke Marshall is also a real concern as is Jared (Payne) who missed the Scarlets' game."