The unfortunate Billy Vunipola is expected to be out until January after he was injured in Saracens' win over Glasgow Warriors.
Auckland loose forward Dalton Papalii could play his first Test for New Zealand later this year.
The Vunipola brothers, Maro Itoje, Jamie George and Owen Farrell felt the effects of a fiery contest at Scotstoun.
Stuart Hogg's contract expires next year and the Scotland full-back is weighing up his options.
Newcastle Falcons' return to Europe's elite club competition was worth the wait as they beat stunning Toulon at Stade Mayol.
Worcester Warriors had lost 11 away games in a row in the Challenge Cup, but ended that sequence with a brilliant showing in Paris.
Freddie Burns apologised after costing Bath a Champions Cup win over Toulouse with a botched try five minutes from time.
Freddie Burns should have been Bath's match-winner but was distraught after failing to touch down under the posts.
Leinster accelerated out of sight in the second half of their European Champions Cup opener as Wasps were completely outclassed.
An early Perpignan red card ultimately allowed Sale Sharks to cruise to a comfortable victory, inspired by Byron McGuigan.