Munster, Leinster and Ulster will all name their starting teams later this afternoon ahead of another weekend of the Guinness Pro12.
But Connacht will continue their bid for a top-six finish tonight.
Pat Lam's side have Mils Muiliana back in their starting side as they travel to the Arms Park to face the Cardiff Blues.
Meanwhile, Glasgow have a chance to regain the top spot in the table as they host Zebre.
Both matches will kick-off at 19:35.
