Gloucester are sweating on an injury to Danny Cipriani after he was forced off in the first half during their 29-17 Heineken Champions Cup defeat to Exeter.
The England international fly-half went off just before the interval at Kingsholm after taking a heavy knock to his arm and pectoral area.
Gloucester head coach Johan Ackermann said: "He is in a sling and the big thing now is what the investigation will find.
"They originally thought it was in his shoulder, but it looks like it is more in the pectoral (chest) area.
"I don't want to guess. They have to do the full investigation to see the extent of the injury, but hopefully it is something that won't keep him off for weeks and months."
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