Yeovil manager Russell Slade admits Steve Mildenhall's injury looks "very serious" after the goalkeeper was forced off against Walsall.
Mildenhall fears he could be out for two months (Getty)
The goalkeeper lasted until half-time in the 2-0 defeat when he was replaced by defender Craig Alcock, with no sub keeper on the bench for Yeovil.
Yeovil's medical team think it could be cruciate ligament damage.
Slade told BBC Somerset: "We don't know what the damage is at this stage. It appears to be very serious."
Slade thought his side were unlucky not to pick up at least a point on Saturday as Walsall completed the double over Town.
Fortune is not favouring us right now but we'll bounce back
Yeovil boss Russell Slade
"I'm glad to see the back of Walsall this season. At home we dominated them in the first half and should have been three or four up. And today I don't think we deserved to lose.
"The only two opportunities that Walsall had, they finished off. Fortune is not favouring us right now. But we'll bounce back. We're going through a period of transition but we'll come through the other side."
And debutant Liam Bridcutt impressed Slade after the midfielder's loan move from Chelsea.
"I think he did very well, he's mature for an 18-year-old. He wins the ball, he has a good understanding of the game and a good awareness. In periods of the play, I thought he was excellent."