Head coach Leo Cullen revealed that the Ireland star picked up a calf injury in training this week and he joins Tadhg Furlong, Garry Ringrose and Josh van der Flier in missing out.
O'Gara stated that 'Jack Crowley needs to find consistency in his performances; otherwise, he might not make it to the Ireland matchday 23.'
The return of the Ireland tighthead is a significant boost for Leo Cullen amid the critical phase of the Investec Champions Cup, enhancing tactical options.