Munster picked up a signature Champions Cup win as they downed Saracens 17 - 12 in an old school tussle at Thomond Park.
There is no return for O’Mahony, whose last appearance came in the December 13 defeat at Castres.
Ahead of the highly anticipated URC matchup between Leinster and Munster, both teams have welcomed back multiple players to their starting lineup.
World Cup-winning Springbok Jean Kleyn is poised to make his return to action for the first time since November last year after recovering from an eye injury.
Zebo may have retired and RG Snyman may have headed up the N7 to Leinster but Munster's low-key recruitment has been shrewd
Munster have announced the signing of Garryowen centre Bryan Fitzgerald on a three-month deal ahead of the new season.
England U20s may have won the ultimate prize but Ireland's young conveyor belt of talent shows no sign of grinding to a halt
Defeat when a team hasn’t performed fully is the worst kind of loss. That was the ordeal Ireland were put through in Cape Town on Sunday, oscillating from a highly competitive first-half effort in a World Rugby U20 Championship semi-final that finished with them only trailing England 22-20 to not firing a single shot in a second period where they were held scoreless and drably lost 31-20.