Bath could be forced to bring in an emergency hooker replacement after Ross Batty joined their lengthy injury list.
Batty, 25, was taken off with a bad gash to the knee in their Heineken Cup victory over Montpellier on Sunday.
Lee Mears has already been sidelined for at least six weeks with a bicep problem while Pieter Dixon is out for four weeks with an Achilles strain.
"We are working hard to see if there's someone we can bring in," coach Brad Davis told BBC Radio Bristol.
"It's very difficult at this stage to bring in a late replacement who is going to understand everything we've been doing on the training field.
"We don't have any announcements as yet but there could be some late changes come Thursday."
Prop Mark Lilley, who used to play as hooker, came on for Batty on Sunday and could be in line to start on Friday against Worcester Warriors, although they also have the option of recalling academy product Will Tanner from his loan at Clifton.
"I thought Lilley did a fantastic job at such short notice," added Davis. "He hasn't played hooker for a couple of years at least but he hit his mark on a couple of line-outs at the end of the match which were crucial.
"I have 100% confidence in whoever is going to take the number two shirt that they will deliver a performance that's going to make us all proud."