Ulster will be without wing Craig Gilroy and centre Luke Marshall for this Friday's PRO12 clash with Glasgow Warriors at Scotstoun Stadium.
The duo suffered injuries in last week's win over the Scarlets at Kingspan Stadium, with Gilroy having a toe problem while Marshall sustained a concussion. Ireland centre Marshall will now follow the return-to-play protocol.
In other news wing Andrew Trimble is unavailable this week while lock Dan Tuohy and wing Tommy Bowe should soon be available for selection. Meanwhile loosehead prop Kyle McCall is a doubt with a side abdominal issue.