Saracens will give Maro Itoje every opportunity to prove his fitness for Saturday's Champions Cup quarter-final against Northampton.
Itoje was replaced at half-time of Friday's 30-10 Aviva Premiership victory over Bath because of a knee injury, but has a good chance of being ready for the all-English European showdown at Allianz Park.
"We're giving Maro as long as we can," Saracens forwards coach Alex Sanderson said.
"The injury is probably an eight to nine-day lay-off, but he's young and a quick healer so we're hoping he'll come through for Thursday's session.
"On Thursday we'll see how he's going. If he's fit, we'll play him because he's in outstanding form."