There is a new back-row this week with O'Mahony joining Niall Ronan and James Coughlan in the back three. Tommy O'Donnell is out of the squad following a knee injury sustained in last Friday's fixture against Zebre.
In rotating the squad Penney has opted with new half-backs this week with Duncan Williams and Ian Keatley replacing Cathal Sheridan and JJ Hanrahan in the starting line-up.
Munster: Denis Hurley; Keith Earls, Casey Laulala, James Downey, Simon Zebo; Ian Keatley, Duncan Williams; Dave Kilcoyne, Mike Sherry, Stephen Archer; Donnacha Ryan, Billy Holland, Peter O'Mahony Capt., Niall Ronan, James Coughlan. Replacements: Damien Varley, James Cronin, John Ryan, Donncha O'Callaghan, CJ Stander, Cathal Sheridan, JJ Hanrahan, Ivan Dineen.
Please note this game will not be televised but RTE 2 will show extended Treviso v Munster match highlights on Saturday from 6.00pm.