Exeter are waiting to find out the extent of the groin injury suffered by England second row Geoff Parling.
The 31-year-old lasted four minutes after making his debut as a replacement in Saturday's win over London Irish.
"We'll take assessment over the next few days and see where he's at," Exeter coach Ali Hepher told BBC Sport.
"It was important that we didn't push it too far and make it even worse, so we'll look at it, but the extent of it we don't really know at this stage."
Parling agreed a deal at Sandy Park until the summer of 2017 in January, ending a six-year spell at Leicester, where he won three British and Irish Lions caps.
He was an ever-present in England's side at this summer's World Cup and became the first British Lion to play for Exeter in a league match in the 38-11 victory over Irish.
"It was great to hear the cheer for him and it shows what a good and what a big signing he is for us," Hepher added.
"Him coming in and working on the lineouts is a key area.
"He's already got other guys performances have naturally picked up because equally they want to keep their spots in the side.
"So all round it works well for us. As a rugby brain he'll be great to pick over these next couple of years, so it's great to have that wealth of experience and he'll improve us no matter what."