Leinster hooker Seán Cronin will miss Saturday’s trip to Belfast to take on Ulster in the final round of regular season Pro14 games.
The Ireland international suffered a calf muscle injury in Sunday’s Heineken European Champions Cup semi-final win over Toulouse and has been ruled out of action for this weekend at least.
This inter-provincial clash is a dead-rubber in terms of league position as both teams have already qualified for the Pro14 knock-out stages.
But Cronin’s injury will be a concern for Leinster head coach Leo Cullen with so many big games coming, including the Champions Cup final against Saracens next month.
"At this moment in time, he can’t train or play. Hopefully, he’ll do a small bit of running later in the week but he’s getting assessed now. Right now, he’s a concern," said scrum coach John Fogarty.
Rhys Ruddock will also miss the Ulster game having pulled up in the captain’s run ahead of the win over Toulouse feeling unwell.
Jonathan Sexton and Rory O’Loughlin both returned from injury to feature at the weekend and both came through unscathed so will be fit to face Ulster if selected.
Andrew Porter missed out on the Toulouse game due to a pectoral muscle injury and he will be assessed by the province’s medical staff later this week before a decision on his inclusion against Ulster is made.
Jamison Gibson-Park is in the same boat having suffered a hamstring injury in the recent Pro14 win over Glasgow.