Harry Byrne will start at out-half for Leinster in Sunday's Investec Champions Cup Pool 4 opener against La Rochelle with Leo Cullen making 11 changes to his side for their rematch with the defending champions.
Byrne continues in the 10 shirt, getting the nod over Ciarán Frawley who is held back in reserve.
Tadhg Furlong misses out for the four-time champions, having featured off the bench in last weekend's win over Connacht as Michael Ala'alatoa retains his place at tighthead, while Robbie Henshaw and Ryan Baird are the others who stay in the starting XV.
Ala'alatoa is joined in the front row by Andrew Porter and Dan Sheehan, while Baird shifts from the second row to flanker, paving the way for Joe McCarthy and co-captain James Ryan to start at lock.
Will Connors is given a big opportunity to start at openside flanker with Josh van der Flier on the bench, while Caelan Doris comes in at number 8, as Jack Conan misses out on selection.
Jamison Gibson-Park starts at out-half to partner Byrne behind the scrum, while Henshaw moves from outside to inside centre, allowing co-captain Garry Ringrose come in at 13.
Cullen has gone with a new back three, as Hugo Keenan starts at full-back, in between wings Jimmy O'Brien and Jordan Larmour.
La Rochelle: Brice Dulin; Dillyn Leyds, Ulupano Seuteni, Jonathan Danty, Jules Favre; Antoine Hastoy, Tawerra Kerr-Barlow; Reda Wardi, Pierre Bourgarit (capt), Uini Atonio, Thomas Lavault; Will Skelton, Paul Boudehent, Levani Botia, Yoan Tanga.
Replacements: Sacha Idoumi, Joel Sclavi, Georges-Henri Colombe Reazel, Ultan Dillane, Rémi Picquette, Judicaël Cancoriet, Teddy Iribaren, Hugo Reus.
Leinster: Hugo Keenan; Jordan Larmour, Garry Ringrose (co-capt), Robbie Henshaw, Jimmy O'Brien; Harry Byrne, Jamison Gibson-Park; Andrew Porter, Dan Sheehan, Michael Ala'alatoa; Joe McCarthy, James Ryan (co-capt); Ryan Baird, Will Connors, Caelan Doris.
Replacements: Rónan Kelleher, Cian Healy, Thomas Clarkson, Jason Jenkins, Josh van der Flier, Ben Murphy, Ciarán Frawley, Charlie Ngatai.
Tadhg Beirne (above) will take over the captaincy for Munster in their Pool 3 meeting with Bayonne on Saturday night (live on RTÉ2 and RTÉ Player), as the injuries pile up for head coach Graham Rowntree.
Edwin Edogbo, Diarmuid Barron, Shane Daly, Oli Jager, Simon Zebo and Patrick Campbell have all been ruled out with minor injuries, with three academy players in the matchday squad.
In spite of the injuries, Beirne leads an experienced pack, with the Ireland international joined by Fineen Wycherley at lock.
Scott Buckley comes in at hooker in place of the injured Barron, and is joined up front by props John Ryan and Jeremy Loughman.
Tom Ahern continues at flanker after an impressive run, where he links up with Gavin Coombes and John Hodnett.
Conor Murray is one of six changes to the starting side, replacing Craig Casey at scrum-half, and he partners Jack Crowley in the half-backs.
Antoine Frisch misses out, so Alex Nankivell moves to outside centre with Rory Scannell in at 12.
Calvin Nash makes a rare start at full-back, with Sean O'Brien and Shay McCarthy both making Champions Cup debuts on the wings.
Among the replacements, there's a first Munster appearance for hooker Eoghan Clarke, while academy prospect Ben O'Connor is set for a Champions Cup debut.
Munster: Calvin Nash; Shay McCarthy, Alex Nankivell, Rory Scannell, Seán O'Brien; Jack Crowley, Conor Murray; Jeremy Loughman, Scott Buckley, John Ryan; Fineen Wycherley, Tadhg Beirne (capt); Tom Ahern, John Hodnett, Gavin Coombes.
Replacements: Eoghan Clarke, Josh Wycherley, Stephen Archer, Jack O’Donoghue, Alex Kendellen, Craig Casey, Tony Butler, Ben O’Connor.
Bayonne: Cheikh Tiberghien; Bastien Pourailly, Peyo Muscarditz, Riko Buliruarua, Rémy Baget; Thomas Dolhagaray, Maxime Machenaud; Matis Perchaud, Facundo Bosch, Tevita Tatafu; Denis Marchois, Kote Mikautadze; Pierre Huguet, Baptiste Heguy, Rodrigo Bruni.
Replacements: Thomas Acquier, Swan Cormenier, Junior Tagi, Arthur Iturria, Rémi Bourdeau, Gela Aprasidze, Arnaud Erbinartegaray, Tom Spring.
Iain Henderson (above) returns to captain Ulster for their opening game against Bath in Pool 2.
The Ireland international returns from a short-term injury to lead the side at The Rec, where he's joined by Alan O'Connor in an experienced second row.
The front row remains unchanged from last week’s United Rugby Championship defeat against Edinburgh, as World Cup-winning Springbok prop Steven Kitshoff makes his European debut for his new club. Hooker Tom Stewart and tighthead prop, Tom O’Toole, retain their places in the front row.
Former Exeter Chiefs man Dave Ewers returns to the starting line-up at blindside flanker, Nick Timoney starts on the openside, with academy forward James McNabney starting at number 8 again as he makes his third start in succession.
Nathan Doak and Billy Burns form the half-back partnership, while the centres remain unchanged from last week, as Stuart McCloskey and James Hume hope to stamp their authority in Bath.
Jacob Stockdale starts on the left wing, with Rob Baloucoune retaining his spot on the opposite wing after grabbing his first try of the season last week.
Versatile back Stewart Moore starts at 15 to complete the back-field.
There is a welcome return for Ireland international Rob Herring, who returns to the matchday 23 after injury kept him out against Glasgow Warriors and Edinburgh.
Jake Flannery and Mike Lowry also return to the squad, following their injuries.
Bath: Matt Gallagher; Joe Cokanasiga, Ollie Lawrence, Cameron Redpath, Will Muir; Finn Russell, Ben Spencer (capt); Beno Obano, Tom Dunn, Will Stuart; Elliott Stooke, Charlie Ewels; Miles Reid, Sam Underhill, Alfie Barbeary
Replacements: Niall Annett, Juan Schoeman, Thomas du Toit, GJ van Velze, Jaco Coetzee, Louis Schreuder, Orlando Bailey, Will Butt.
Ulster: Stewart Moore; Rob Baloucoune, James Hume, Stuart McCloskey, Jacob Stockdale; Billy Burns, Nathan Doak; Steven Kitshoff, Tom Stewart, Tom O’Toole; Alan O’Connor, Iain Henderson (capt); Dave Ewers, Nick Timoney, James McNabney.
Replacements: Rob Herring, Andrew Warwick, Marty Moore, Kieran Treadwell, Matty Rea, John Cooney, Jake Flannery, Mike Lowry.
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