Ireland back Jared Payne is unlikely to feature against Wales this week after missing training on Monday.
Payne returned from a kidney injury last weekend for Ulster in their win over Treviso, but sat out Monday's session.
The 31-year-old was a regular starter for Ireland last year and has been replaced in the starting line-up since his injury by Leinster's Garry Ringrose.
"Jared Payne, Tiernan O'Halloran, Dan Leavy and Joey Carbery all stepped out of training today with a few bumps and bruises," said Ireland forwards coach Simon Easterby.
"Jared felt pretty good on the weekend, pretty sharp. But he has been a long time out of the game.
"We have been pretty comfortable with what we have picked so far and we're happy with the guys who have been playing in those positions.
"For Jared it is great to have him back around and hopefully we will see him train on Wednesday and then we will take it from there.
"Jared has bruising, it's nothing worse than that. He has been out for a long time and some players will take a little bit more to recover from games, especially when they have been out for so long."
There was better news for Ireland with Rob Kearney coming through Monday's session unscathed following a hip issue.