Donncha O'Callaghan and Paul O'Connell make up the second row partnership and David Wallace has been named at openside.
Castres' line up contains a few surprises. Veteran Sadourny will play at out half instead of Yann Delaigue and Laurent Marticorena will play at center putting former international Richard Dourthe on the bench. Prop Mauricio Reggiardo who was supposed to be unavailable for three weeks is on the bench, Justin Fitzpatrick will be starting.
Christian Cullen, Mossie Lawlor, Shaun Payne, Rob Henderson, Anthony Horgan, Ronan OGara, Peter Stringer, Marcus Horan, Frank Sheahan, John Hayes, Donncha OCallaghan, Paul OConnell, Jim Williams, David Wallace, Anthony Foley (capt).
Replacements: James Blaney, Gordon McIlwham, Trevor Hogan, Alan Quinlan, Mike Prendergast, Paul Burke, Mike Mullins.
Justin Fitzpatrick, Mario Ledesma, Alessio Galasso, Lionel Nallet, Nicolas Spanghero, Alexandre Bias, Rodrigo Capo Ortega, Paul Volley, Alexandre Albouy, Xavier Sadourny, David Bory, Mark Denney, Laurent Marticorena, Brad Fleming, Ugo Mola.
Remplacements: Remy Vigneaux, Mauricio Reggiardo, Romain Froment, Jaques Deen, Nicolas Morlaes, Richard Dourthe, Benjamin Lhande.