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.
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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.
