Gloucester hope Freddie Burns' left knee injury is just a recurrence of a problem suffered in pre-season.
Fly-half Burns limped out of Saturday's 36-16 Mont de Marsan victory after just 12 minutes, after suffering a medial knee ligament strain.
The 22-year-old suffered damage to the same knee in pre-season that proved nothing too serious, and Gloucester boss Nigel Davies hopes this latest blow ends up the same.
Gloucester bosses were frustrated with alleged foul play in Saturday's Amlin Challenge Cup victory, which secured a home quarter-final against Biarritz.
The Cherry and Whites submitted a citing report European Rugby Cup chiefs, alleging that Mont de Marsan replacement prop Morgan Phelipponneau kicked Shaun Knight twice in the head.
Gloucester made eye-gouging allegations made against Mont de Marsan back in October when Andy Hazell was sent off and then banned for 14 weeks.
No action was taken against the Frenchmen then – but this time rugby director Davies hopes ERC will act.
Davies explained: "Freddie has a problem with the medial ligament in his left knee, similar to what he had in pre-season.
"That kept him out for about three weeks then, and fingers crossed this won't be any worse than that.
"But we'll have to keep assessing that to see how he holds up.
"He'll link up with the England camp as planned."