One of the major threats to Leinster's position at the top of the Pro12 table tomorrow night will arrive in the form of ex-Blues lock Tadhg Beirne.
The Kildare native has been outstanding for Scarlets in recent weeks and has been one of the major reasons why the Welsh side find themselves in the play-off positions.
Beirne found his first-team opportunities at Leinster limited and having come through the Academy system, the 24-year old opted for a fresh challenge, having made just four appearances in his first full season with his home province.
Now in his second year with the Scarlets, Beirne is thriving and Girvan Dempsey is looking forward to welcoming him back to the RDS.
"They are strong. They're on a run of form now," backs coach Dempsey said.
"Munster were impressive in the first half (last week) and went into that 21-point lead but Scarlets showed really good composure and were excellent in the second half. They took their chances when they were afforded to them.
"You look at their squad and they strong across the board. Tadhg Beirne has gone over there from our system and done really well. He's been getting a regular start.
"He's worked really hard. He was unfortunate with injuries, he was just plagued with them. Sometimes players just need a bit of luck, a bit of an injury-free run. And that's what he's got. He's done exceptionally well.
"He's slotted into their environment and done brilliantly. I'd imagine he'll be relishing the opportunity to come back to the RDS this weekend."
Beirne grew up near Adam Byrne, and the winger, who has scored nine tries in 12 starts, is relishing the prospect of coming up against his old mate.
"I know him well. He lives about five minutes away from me back in Kildare - he's a couple of years older than me," Byrne explained.
"We always got on well, and we stay in touch. It's great to see him doing well over there. He's a really good player.
"He came up through the system in here, and he was marked, so he's going to be good. I think he was unfortunate with a few injuries he had, especially last year. It's great to see him back, injury-free and playing well."
Despite Leinster's impressive home record, Dempsey has warned that Scarlets will be a dangerous proposition.
"Across the backline, they just have threats everywhere. It's going to be a big challenge and we know that we have to perform because our ambition is to get a home semi-final."