Saracens coach Mark McCall hopes Mako Vunipola will be available for their big matches at the end of the domestic and European season.
The England prop was withdrawn from Saturday's 44-20 win over Worcester after only seven minutes, mainly as a precaution, after his hamstring tightened up.
But McCall now faces a nervous wait to see if the 23-year-old has suffered any more serious damage ahead of their Premiership semi-final in two weeks' time and the Heineken Cup final against Toulon in Cardiff on May 24.
"Mako just tightened up his hamstring, and with the games we've got coming up we got him off the pitch as soon as we could," said McCall.
"Hamstrings are too hard to tell, he just had an awareness and we thought we'd get him off the pitch.
"We'll have more news on that in the next few days."
Saracens had Owen Farrell in their side at Allianz Park but, with his foot injury still not fully healed, it was Alex Goode who took place-kicking duties.
But McCall is also hopeful the England fly-half will be able to return to goal-kicking duties in their final regular season clash, which comes up against the Leicester Tigers next Saturday.
"Owen's foot is fine, but it's just place-kicking that seems to aggravate it a small bit," said McCall. "So we're just giving him a week or so without having to do that again.
"We're very confident he'll be place-kicking by the middle of next week. So it was just a case of getting Owen's place-kicking foot right. But as you saw he played pretty well apart from that.
"Alex Goode showed his class again against after showing his temperament last week in the Heineken Cup semi-final win over Clermont.
"And we're fortunate to be in the position with Charlie Hodgson's injury that we've got someone like Goodey who can step in at 10 and also goal kick."