Hanrahan has been extremely disciplined in following his rehabilitation programme and is named in the replacements. His impressive work-rate and dedicated approach have helped the young out-half recover from the moderate groin tear he sustained against Glasgow Warriors earlier in the month.
While Donnacha Ryan, who has been battling with a foot injury since the Treviso game in March, did take part in this week's training programme but has not been included in the side after a final assessment was made following this morning's training session in Thomond Park.
Sean Dougall returns to a starting Heineken Cup XV for the first time since Perpignan away in December and joins CJ Stander and James Coughlan in the back-row.
Penney keeps faith with the front-five that started in the quarter-final v Toulouse, and with Casey Laulala recovering from a fractured bone in his hand the Head Coach can call on the same back-line also.
With the change to the back-row Tommy O'Donnell is named in the replacements while James Cronin returns from a sprained ankle to also feature in the squad.
Munster: Felix Jones; Keith Earls, Casey Laulala, James Downey, Simon Zebo; Ian Keatley, Conor Murray; Dave Kilcoyne, Damien Varley Capt., BJ Botha; Dave Foley, Paul O'Connell; CJ Stander, Sean Dougall, James Coughlan. Replacements: Duncan Casey, James Cronin, John Ryan, Donncha O'Callaghan, Tommy O'Donnell, Duncan Williams, JJ Hanrahan, Denis Hurley.
Referee: Wayne Barnes