Paddy Wallace will be out of the Ulster team for up to three weeks with Rory Best and Tommy Bowe said to be "recovering well" from their injuries ahead of Friday's clash against Munster.
Luke Marshall, Andrew Trimble, Darren Cave and Rob Herring all suffered soft tissue injuries in the defeat to Leinster in the RDS on Saturday evening.
All four are responding well to treatment and all four are expected to be available for selection for Friday's match against at Ravenhill.
Iain Henderson, Chris Henry and Nick Williams have all resumed full training. A decision on whether they will feature against Munster will be taken later in the week.
Johann Muller will be available for selection having been rested for the Leinster match.
Paddy Wallace has a muscle tear in his leg and will be out for up to three weeks.