The pair missed Saturday’s 3-0 defeat in the Premiership at Chelsea.
Full-back Thatcher (pictured right) suffered a shin problem in training at the back end of last week while top scorer Rebrov (pictured below) has a thigh strain.
Luke Young deputised at left-back for Thatcher at Stamford Bridge while Willem Korsten partnered Les Ferdinand up front. They are likely to figure again on Tuesday if Thatcher and Rebrov fail to make it.
Boss George Graham confirmed: “If they missed out on Saturday it is safe to assume they will be doubtful for Tuesday.”
Sol Campbell, Mauricio Taricco, Oyvind Leonhardsen, Chris Armstrong and Steffen Iversen are all on our current casualty list.
Skipper Campbell is expected to be out for another fortnight as he recovers from surgery on his dislocated shoulder.
Full-back Taricco and Iversen both require surgery and striker Iversen could be out for up to six weeks after his knee operation.
Midfielder Leonhardsen fears a lay-off of months rather than weeks with his hamstring tear.
At least the news is better about Armstrong. The striker — yet to feature in the Premiership — is scheduled to return to action in a week to 10 days after an injection eased his groin problem.
Sergei Rebrov and Ben Thatcher are both doubtful for Tuesday’s Worthington Cup clash against Birmingham City as our injury problems continue to mount.