Saracens left Swansea on Saturday with an injury scare surrounding No 8 Billy Vunipola and their European Champions Cup quarter-final hopes hanging by a thread.
Saracens rugby director Mark McCall said that Vunipola suffered an arm injury that forced him off at half-time as the Champions Cup holders were held 15-15 by Pool Two rivals Ospreys.
Vunipola, playing only his second comeback game after a three-month absence with knee trouble, could now be a concern for the start of England’s Six Nations campaign, which begins against Italy in Rome on February 4.
Vunipola’s injury completed a difficult day for England head coach Eddie Jones after Wasps flanker James Haskell was dismissed in his side’s defeat to Harlequins.
“He [Vunipola] has an arm injury which we will obviously explore right away,” said McCall.
“I don’t know what the extent of the injury is.
“Michael Rhodes has pulled a hamstring, so we had quite a lot to contend with. Our starting back-row were gone by half-time, and Jackson Wray went before the game, so there was a lot to deal with.
“But ultimately, it came down to the scrum today. It was just not good enough.”
Saracens fly-half Owen Farrell and his opposite number Dan Biggar each kicked five penalties, with Biggar’s final equalising strike arriving just a minute from time.
Saracens now realistically need a bonus-point victory over Allianz Park visitors Northampton next weekend to have any chance of progressing as a best runner-up.
But even then, their European title hat-trick bid staying alive will still hinge on results elsewhere, while Ospreys must beat Clermont Auvergne in France to have any chance of progressing.
McCall added: “We knew beforehand what the pools were, but it is completely out of our hands now.
“It was scrappy, tight, stop-start game with the weather being the way it was, but when it came down to penalty count at scrum-time, we lost that really heavily and that was the fundamental problem.
Racing 92 vs Munster
January 14, 2018, 3:15pm
Get Sky Sports Get a Sky Sports pass
“It is not in our hands. If the Ospreys beat Clermont next week, we are out of the competition if other results go [against us], and maybe we don’t deserve to be in the competition because we have lost back-to-back games against Clermont and drew a game today.
“We have probably not been quite good enough in the competition, although we started it well.
“The Clermont home game happened (Saracens lost 46-14), and we had to deal with it. As a group, we dealt with it and did pretty well from there on, but that was probably the one which we will look back on and regret.”