Just one week out from next Sunday's European Champions Cup quarter final against Leinster at the Aviva Stadium, Saracens could be sweating on the fitness of two key British and Irish Lions.
Owen Farrell and George Kruis are both carrying knocks into the game-week, with Director of Rugby Mark McCall saying there's no guarantee Farrell will be fit for the trip to Dublin.
The pair both missed Sarries' 24-11 win against Harlequins yesterday, which was played at West Ham's London Stadium.
"We hope he (Farrell) will be [fit] but there's no guarantee.
"He's got a quad injury, it's a muscle injury and you never really know with these things.
"George Kruis has got a back injury, it is what it is and we will deal with what we have to do next week," McCall added.
Saracens are also unlikely to have Billy Vunipola available for the game. The influential number eight missed the entire Six Nations campaign with a broken arm, with McCall hinting last week that the England international was unlikely to feature.
The two-in-a-row champions limped through their Champions Cup pool as an 8th seed, but have found some decent form in recent months, winning six of their last eight Premiership games, a run which keeps them second in their domestic table.
Leinster, meanwhile, shipped a 32-18 defeat to the Ospreys last night, and while a number of their international contingent did return to play the game, the likes of Johnny Sexton, Rob Kearney, Cian Healy, Tadhg Furlong, James Ryan and Dan Leavy were all given the night off.
Noel Reid, Fergus McFadden and Dave Kearney could all be in doubt for the game at the Aviva Stadium next Sunday. Reid and McFadden were forced off for HIA's, while Kearney departed the game just 11 minutes after entering, with his arm in a sling.
Jordan Larmour is also touch and go for the last eight encounter. He missed last night's defeat with a leg injury, with an update expected on his progress tomorrow.