A win for the Blues away to Castres will do just that for Leo Cullen's side.
The head coach has made three changes – all to the pack – from the side that comfortably dispatched Montpellier last week.
Kick off tonight is at 7.45, with Montpellier and Northampton starting at the same time.
Munster, Connacht and Ulster all name their teams around midday for their games this weekend.
