Sean Cronin has been ruled out of Leinster’s Champions Cup game against Montpellier at the RDS on Friday.
Leinster scrum coach John Fogarty confirmed the news on Tuesday and said Jonny Sexton has come through unscathed in last week’s hammering of Zebre.
Cronin suffered a hamstring injury and the extent of the injury will be known later this week after further scans.
Academy prop Andrew Porter has passed the return-to-play protocols and both Ed Byrne and Cathal Marsh made competitive returns for UCD and St. Mary’s College at the weekend as they returned from injury. It was Byrne’s first game since August 2015 when he injured his knee against Ulster in a pre-season friendly.
Fogarty also confirmed that Mike Ross and Fergus McFadden would be stepping up their rehabilitation programmes this week and would again take part in on-field training with the rest of the Leinster squad.
“I think if you look at where we were this time last season against Bath in round 5 to where we are now we have made some good progress,” said Fogarty.
“For the players, six made their first starts that night in the RDS in a game that had no significance for us in terms of Europe unfortunately but has played a huge role in the development of those young lads.
“As a province as well, we are in a better place and I suppose Friday gives us the chance to top the pool and after that we will see about a home quarter-final. But we have to do our jobs right on Friday first against Montpellier and I think it can be a really special night for this group of players and this side and I hope the crowd play their part in that too.”