Bath forward Peter Short is set to undergo knee surgery which will keep him sidelined for up to three months.
Short is useful at the line-out
Short, who signed from French side Narbonne over the summer, sustained the injury in the build-up to last week's Premiership opener against Bristol.
Meanwhile, David Bory (hernia) and Tom Cheeseman (shoulder surgery) could return from injury on Monday for the Guinness A league match at Gloucester.
Prop David Flatman is also hoping to be fully fit in the next four weeks.