The only other change to the side sees James Downey renew his centre partnership with Casey Laulala.
With the returning O'Mahony, CJ Stander moves to the replacements while John Ryan takes the place of James Cronin who is ruled out with an ankle sprain.
Alan Cotter and Gerhard van den Heever, who was one of three players added to the Heineken Cup squad in March, are both named in their first match-day Heineken Cup squad.
Munster: Felix Jones; Keith Earls, Casey Laulala, James Downey, Simon Zebo; Ian Keatley, Conor Murray; Dave Kilcoyne, Damien Varley, BJ Botha; Dave Foley, Paul O'Connell; Peter O'Mahony Capt., Tommy O'Donnell, James Coughlan. Replacements: Duncan Casey, John Ryan, Alan Cotter, Donncha O'Callaghan, CJ Stander, Duncan Williams, JJ Hanrahan, Gerhard van den Heever.
Please note this game is completely sold-out and the match-day information for travelling supporters can be found here.