In what will be a relief for his fans and himself, Sean O Brien will appear in a blue jersey for the first time since October.
The Tullow man injured his arm in the Autumn Internationals with Ireland before Christmas and has been on the road to recovery ever since.
The timing is important as it’s the last pool match for Leinster in the European Cup and comes just ahead of the Ireland training camp to prepare for the first two games in the Six Nations.
Joe Schmidt named Sean in the squad during the week despite not having played a games in a few months, however a few minutes for Leinster on Sunday will get him ready for the busy months ahead.
Leo Cullen welcomes back some familiar faces for the clash on Sunday in Round 6 (Kick Off: 3.15pm)
Cullen keeps faith with the same back three that scored two tries between them in the win over Toulouse last weekend with Jordan Larmour at full back and Adam Byrne and Dave Kearney on the wings.
Robbie Henshaw returns from a hamstring injury to take his place in the centre alongside Garry Ringrose. It’s the Westmeath man’s first game since late October for Leinster.
At half back Jamison Gibson-Park comes in to partner Ross Byrne.
In the pack Jack McGrath comes into the front row alongside Seán Cronin and Tadhg Furlong and there is a change in the second row too with Devin Toner taking his place alongside James Ryan having recovered from an ankle injury.
There is no change from last week in the back row with Rhys Ruddock again leading the side from blindside flanker.
Also on the bench Leinster Academy scrumhalf Hugh O’Sullivan is in line to make his European debut. The Meath man is in his second year in the Academy and only turns 21 next month.
Leinster Rugby (caps in brackets):
15. Jordan Larmour (32)
14. Adam Byrne (47)
13. Garry Ringrose (59)
12. Robbie Henshaw (31)
11. Dave Kearney (129)
10. Ross Byrne (61)
9. Jamison Gibson-Park (64)
1. Jack McGrath (138)
2. Seán Cronin (165)
3. Tadhg Furlong (95)
4. Devin Toner (226)
5. James Ryan (25)
6. Rhys Ruddock (154) CAPTAIN
7. Josh van der Flier (70)
8. Jack Conan (84)
16. James Tracy (82)
17. Cian Healy (201)
18. Andrew Porter (44)
19. Scott Fardy (34)
20. Seán O’Brien (121)
21. Hugh O’Sullvan (6)
22. Noel Reid (112)
23. Rory O’Loughlin (53)