Jamie Hagan has signed a three-month contract to return to Leinster from London Irish.
The once-capped prop could be in line to play against Benetton Treviso in the Guinness PRO12 League out in Italy on Sunday.
The reason behind the move by coach Matt O'Connor is the likely end of loose-head Edward Byrne's season to a torn anterior cruciate ligament suffered against Edinburgh.
"Ed is having surgery tomorrow which is very disappointing for him," said Leinster coach Matt O'Connor.
"He has been doing a great job for us, the involvement he's had. As a result, we're a little light with the other injuries to the front rowers."
The grass isn't always greener on the other side of the Irish sea either, as Hagan has not played as much as he would have planned in The Premiership.
The Balbriggan man has earned just 27 caps for Irish since moving there in the summer of 2013.
"I don't really know the reasons for that. He wants to play. All pro players want to play," said O'Connor.
"With the opportunities he could have in our environment, it is a win-win for everybody. He'll certainly get some rugby with us in the short-term. We'll see how that pans out."
The Leinster coach was also "hopeful" that one or even all of Dave Kearney, Fergus McFadden, Shane Jennings and Jordi Murphy could be in line to return from various injuries.