Saracens loose forward Will Fraser has been ruled out of the remainder of the European season, because of a longstanding back problem.
England flyhalf Owen Farrell is in doubt for the Six Nations, after hobbling off with a knee injury during Saracens' 6-18 Euro defeat at Clermont.
NEWS: The French clubs got the best of the draw for the European Champions Cup quarterfinals.
Munster ended their European Rugby Champions Cup campaign on a high with a 65-10 thumping of Sale Sharks at Thomond Park.
Bath wrote their name into the history books by becoming the first club to qualify for the quarterfinals as group winners after losing their opening two matches.
Forwards coach Chris Gibbes did not pull any punches in his blunt assessment of the Ospreys' defeat in Italy.