Mike Sherry is expected to miss the next six months after rupturing the cruciate ligament in his left knee.
Tighthead prop, John Afoa, is to leave Ulster at the end of this season, having signed a long-term deal with an Aviva Premiership club.
Munster elected to stay in Italy for some extra training ahead of their encounter against Treviso in Round 3 of the RaboDirect Pro12 but the Italian outfit were up for this encounter.
Leinster travelled to Glasgow where they would face stiff opposition from the Scottish side who were looking to keep their place on top of the RaboDirect Pro12 table
Connacht entertained Ulster in Galway at the weekend in Round 3 of the RaboDirect Pro12 with the visitors searching for their first win of the season.
The highlights from Round 2 of the Rabo Direct Pro12