Casey starts as Beirne wins 100th Munster cappublished at 12:14 GMT 16 January
Image source, InphoCraig Casey has recovered from the shoulder injury he sustained in Munster's defeat in Toulon
Craig Casey has recovered from a shoulder injury to start for Munster in Saturday's Investec Champions Cup game with Castres.
The Ireland scrum-half was forced off in the second half of Sunday's loss to Toulon but has been passed fit to start in Limerick.
Head coach Clayton McMillan has made three changes from that defeat as Thaakir Abrahams, Niall Scannell and Jean Kleyn come into the side.
Ireland forward Tadhg Beirne will win his 100th Munster cap in the final European Pool game.
Munster are fourth in Pool Two and will likely need a victory to secure their place in the knockout stages, while Castres are bottom but can leapfrog the Irish province with victory at Thomond Park.
Abrahams joins Shane Daly and Ben O'Connor in the back three while Alex Nankivell and Tom Farrell have retained their places at centre as Jack Crowley will partner Casey at half-back.
The front row comprises of Jeremy Loughman, the returning Scannell and Michael Ala'alatoa, and Kleyn and Fineen Wycherley pack down in the second row.
Centurion Beirne will captain the side from the back row alongside Jack O'Donoghue and Gavin Coombes.
Prop Oli Jager is named on the bench and is set to make his first appearance since sustaining a head injury in October.
Munster: S Daly; T Abrahams; T Farrell, A Nankivell; B O'Connor; J Crowley, C Casey; J Loughman, N Scannell, M Ala'alatoa; J Kleyn, F Wycherley; T Beirne (C), J O'Donoghue, G Coombes.
Replacements: L Barron, M Milne, O Jager, E Edogbo, B Gleeson, E Coughlan, JJ Hanrahan, D Kelly.
Snyman, Ringrose and O'Brien return for Leinster
Image source, InphoGarry Ringrose has not played for Leinster since the start of December
Leinster will welcome back a trio of internationals for their final Pool Three match in Bayonne.
South African second row RG Snyman and Ireland backs Garry Ringrose and Jimmy O'Brien will all make their first appearances since December.
Ireland second row James Ryan will make his 50th European appearance for the Irish province.
Leo Cullen's side have already qualified for the knockout stages while Bayonne are bottom of the Pool and without a point.
O'Brien will join Tommy O'Brien and Joshua Kenny in the back three while Ringrose and Robbie Henshaw will form a familiar centre partnership.
Harry Byrne has been rewarded for his match-winning kick against La Rochelle and starts at fly-half alongside Jamison Gibson-Park.
Prop Tadhg Furlong begins in the front row with Ronan Kelleher and Jack Boyle, while Synman and Ryan will partner at lock.
The back row comprises of Max Deegan, Josh van der Flier and captain Caelan Doris. Leinster have also named a strong bench which includes Dan Sheehan, Joe McCarthy, Sam Prendergast and All Black Rieko Ioane.
Leinster: J O'Brien; T O'Brien; G Ringrose, R Henshaw; J Kenny; H Byrne, J Gibson-Park; J Boyle, R Kelleher, T Furlong; RG Snyman, J Ryan; M Deegan, J van der Flier, C Doris (capt).
Replacements: D Sheehan, J Cahir, T Clarkson, J McCarthy, S Penny, L McGrath, S Prendergast, R Ioane.



















