Super League Grand-Final winner Josh Jones is to cut short his stay in rugby union for family reasons and return to the 13-man code having been released by Exeter.
Leicester fly-half Owen Williams is expected to be sidelined for around eight weeks after breaking his jaw during the Tigers' Aviva Premiership victory over Northampton last Saturday.
Zach Kibirige has thrived when he has been given the opportunity to play for Newcastle Falcons this season, but wants to achieve more personally with the north-east club.
Late tries from Frank Halai and Sailosi Tagicakibau snatched both a win and a consolation bonus point away from Worcester as Wasps came from behind to win 32-22 at the Ricoh Arena.
Saracens have confirmed that George Kruis suffered a concussion during their 29-23 Aviva Premiership defeat by Harlequins and will now have to follow the return to play protocols.
England centre Manu Tuilagi made a long-awaited comeback from injury as Leicester claimed a dramatic last-kick 30-27 victory over their fierce Aviva Premiership rivals Northampton at Welford Road.
Harlequins inflicted the first defeat of the season for Saracens in a stormy showdown at Twickenham Stoop that also left the Aviva Premiership champions with concerns over lock George Kruis.
Exeter Chiefs boosted their Aviva Premiership title challenge by taking their unbeaten home run past the one-year mark with a 19-10 victory over Gloucester.
Dylan Hartley continues to lose ground in his quest to be named England hooker and captain for the RBS 6 Nations after being confined to the bench for Northampton's Aviva Premiership clash with Leicester.
This weekend sees London Irish face Newcastle Falcons in the Aviva Premiership, with Falcons currently sitting on place above the Exiles at the bottom of the table.