Leinster head coach Leo Cullen expects fit-again Sean O’Brien to make a big contribution from the bench in Sunday’s Heineken Champions Cup Pool 1 closer against Wasps.

O’Brien broke his arm in Ireland’s win over Argentina last November and he hasn’t played since.

But the versatile back-rower is named among this weekend’s replacements and he is very much part of Cullen’s thinking.

"Sean is doing well," said the Leinster head coach. "He’s worked hard to get back and he brings the experience which he has, he brings good coverage having played at 6, 7 and 8, which makes a big difference.

"He has trained well and he is so excited about playing, he’s dying to get back and hopefully it goes well for him."

O’Brien’s career has been blighted by injury and he wasn’t long back in action when he suffered his latest setback, the broken arm against Los Pumas.

Sean O'Brien helped from the field in the Argentina game

Cullen paid tribute to the Carlow man, saying that he comes back each time hungrier for more.

"It just makes him hungrier than ever, especially as he gets a little bit older," explained the former European Cup winning captain-turned coach.

"For him, he knows it’s a big game. He looked on a lot of big games last year which he missed out on and that has given him a real hunger for it. He wants to get back out there.

"He did well early in the season, he was involved in five or six games in-a-row and then he was incredibly unlucky to pick up a broken arm having worked his way back from the other knocks.

"He was able to run the period he was off with his broken arm and now he’s just dying to get back involved playing.

"Seanie is one of those types of people who’d rather play every week; he loves playing and he loves performing. Hopefully he gets a decent run this weekend."

The back-row for the Wasps game is made up of captain Rhys Ruddock, Josh van der Flier and Jack Conan.

O’Brien is likely to come into the action regardless of the score and he offers cover in all three positions. He hasn't played for Leinster since October.

Follow Wasps v Leinster (kick-off 3.15pm, Sunday) via our live blog on RTÉ.ie/sport and the News Now app or listen to regular updates on RTÉ Radio 1's Sunday Sport.