Connacht and Leinster will name their teams today for their clashes with Zebre and Exeter respectively.
Rob Kearney is a major doubt for Leinster with a back injury but back row Kevin McLaughlin should be available despite picking up an arm injury against Munster last weekend.
Connacht are without Captain Gavin Duffy but John Muldoon is expected to start having made his comeback in last weeks defeat to Ulster.
Tonight Ulster host Castres in their opener at Ravehill , kick off is at 8.
Munster kick off their campaign against Racing Metro in Paris tomorrow, second row Paul O’Connell starts his first game of the season having recovered from his knee injury.
Former Munster , Ireland and Lions hooker says selecting O’Connell is the right move even though he hasn’t played yet this season.