Out-of-form Ulster are away to European champions La Rochelle this evening in the Heineken Champions Cup.
Staying in Pool B, and Munster welcome Northampton to Thomond Park.
And Pool A leaders Leinster will look to preserve their 100 per cent record when they take on Gloucester at Kingsholm.
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In the Challenge Cup, a win for Connacht at home to Brive will secure their place in the knockout phase with a game to spare.
