England hooker Luke Cowan-Dickie could miss the Six Nations after suffering an ankle injury.
The 29-year-old will definitely be sidelined when the Red Rose start the tournament against Scotland at Twickenham on February 4.
Cowan-Dickie sustained the injury during the second half of Exeter Chiefs' win against Northampton Saints on Saturday after scoring two tries.
Exeter director of rugby Rob Baxter told BBC Radio Devon on Tuesday: "Luke's injury looks relatively serious.
"He's seeing a surgeon today; that will maybe give us a more definitive outcome and timing."
Baxter is optimistic British and Irish Lion Baxter can still play a big part for the Chiefs before joining Montpellier at the end of the season.
He added: "It does look like an operation is going to be required but that said, at this stage, it wouldn't be a season-ending situation.
"We could still see him back for a good chunk of the season if rehab and everything goes well."