Munster have made the trip to Manchester for a shoot-out with Saracens at the Allianz Park, with the losers effectively out of the running for qualification from Pool 1.
The Irish province is without the injured Conor Murray, Duncan Williams will come in his place for his first European Champions Cup start.
Meanwhile, Clonmel's Dave Foley will make up the second row with Paul O'Connell and Cahir's Tommy O'Donnell starts in the back row.
That match kicks-off this afternoon at one o'clock at the Allianz Park, while the other Pool 1 game today will see winless Sale taking-on pool leaders Clermont Auvergne at half-five.
Also at half-five, Leinster will be playing host to Castres at the RDS.
Head coach Matt O'Connor has insisted that his side are focusing on trying to win, but the province would ideally be looking to claim a bonus-point victory that would keep them in the hunt to finish on top of Pool 2 ahead of tonight's clash between Harlequins and Wasps at the Twickenham Stoop.
Ulster are also involved in today's European action.
They take the trip to the south of France to face Pool 3 leaders, Toulon from quarter-past three.
