All the team news ahead of Saturday's Challenge Cup clashes including Cardiff Blues v Bath.
Worcester Warriors have signed Samoa international forward Chris Vui on a short-term deal until the end of the season.
Wasps reclaimed second place in the Premiership after shrugging off a number of injuries to beat Worcester at Sixways Stadium.
All the team news for Sunday's Aviva Premiership clashes including Newcastle Falcons v Harlequins.
Worcester Warriors have signed Canada fly-half Connor Braid until the end of the season.
Stephen Myler kicked six penalties as Northampton scraped to a 18-17 Premiership win over Worcester at Sixways.
Mark Tainton was unable to deliver Bristol's first win of the season as they were beaten at Worcester in the Anglo-Welsh Cup.
Worcester have signed scrum-half Michael Dowsett to provide further competition for the No 9 jersey at Sixways.
Upgrade now and get six months half price
Watch instantly from just £6.99. No contract.
Win in our free to enter competitions section
We've a host of top class rugby union action
Previews of round 15, including Man U v Spurs