Exeter hooker Luke Cowan-Dickie is an injury concern for his team after he damaged his ankle in his side's Champions Cup loss to Clermont on Sunday.
The England international was forced off the field in the Chiefs' 35-8 defeat at Sandy Park. Exeter head coach Rob Baxter said Cowan-Dickie had an X-ray which revealed that the ankle was not broken.
But the 23-year-old is set to have an MRI scan on Tuesday, which is expected to reveal ligament damage.
"The X-ray shows no fracture or break, which is very good news," Baxter told the Exeter Express and Echo.
"Luke is now going to have an MRI scan this afternoon, which will then show us the exact extent of the ligament damage in his ankle.
"We are prepared for the worst – I certainly wouldn't expect him to be playing this weekend against Ulster."