The damage from Kevin McLaughlin's scan to his shoulder is not thought to be as serious as first feared.
"How bad is it? It's hard to say. But, it certainly stopped him dead. We'll have to see how that progresses," said coach Matt O'Connor.
The Leinster flanker has had to endure a frustrating few seasons, to say the least.
He looked to be on the brink of another extended stay on the sideline when he left the RDS with a suspected serious arm injury on Friday night.
He was grappling for a spilled ball on the floor when Connacht hooker Tom McCartney appeared to catch him with an accidental boot.
Of course, Rhys Ruddock is currently being nursed back to health from a fractured arm and Dominic Ryan has settled into the number seven jersey where Jordi Murphy is starting to apply pressure again.
Coach O'Connor was strong in his praise of McLaughlin's experience against Connacht until his premature removal in the 46th minute.
Ireland centre/wing Fergus McFadden is scheduled for a return from a finger injury and Gordon D'Arcy could be a valuable asset at Thomond Park.
Wing Darragh Fanning should come back into contention from a rest week with Dave Kearney and Luke Fitzgerald playing out 80 on Friday night.
All of a sudden, Leinster are starting to look like their old selves in terms of personnel, if not quite playing standards.
In theory, these experienced additions could release Ian Madigan back to his original role as an out-half.
With Jonathan Sexton's worrying concussion case, there is a deep need for Madigan to show what he has been unable to do so at ten for Leinster.
At the weekend, Munster's Ian Keatley started on the bench for Munster as JJ Hanrahan showed the talent, but not the consistency of an international out-half.
Ian Humphreys was up-and-down for Ulster as Paddy Jackson works his way back from injury.