Leinster Manager Guy Easterby has confirmed Rhys Ruddock will be out for six week with a fractured arm.
This is balanced out by the planned return to action of hooker Richardt Strauss, wing Dave Kearney, flanker Shane Jennings and centre Gordon D'Arcy to face Connacht in the PRO12 League on Friday night.
Fergus McFadden is not too far away either and Easterby is "very hopeful" of his involvement for the Munster match at Thomond Park.
Props Cian Healy and Martin Moore and centre Ben Te'o are scheduled for January.
Leinster's form of late has not been accurate, disciplined or threatening enough for their supporters.
When you build a brand, you build expectations. The three-time European champions are not playing to the standards set in previous times.
Then again, they do not have the players from then. But this is no place for excuses. It is, as they say, the price you pay for success.
There was a suggestion that the supporters have been spoiled by the almost annual arrival of trophies to the club. "Spoiled? They've had a good time of it, absolutely," said Easterby.
"We're still managing to win games, which is vital. No-one is pretending that we are playing well.
"We understand that we have improvements to make in our performance, as such.
"That's something we're working incredibly hard to make happen.
"Sometimes, not to dig too deep into it, a couple of passes and a bit of luck here and there and that confidence could flow back and you could begin to perform at a better level again".
The only time is right now.
"It's difficult sometimes. They are an educated bunch and, in terms of their rugby education as well. They understand the game. There is a certain level of performance they would like to see.
"What people don't know is what is going on within these four walls in terms of injuries and all these other things. You can say people are out and how that might affect the team and the dynamic and all those things.
"We've lost one game in seven or eight maybe, so we're not a million miles away but I can understand and why people might be frustrated with the level of performance, absolutely."