The Championship club next meet the reigning European champions in the league cup but Whites boss Neil Warnock says he has to tread warily with Thomas as he tries to get him fully fit to anchor a positive run in the league.
"I am still trying to get Jerome fit enough to play a full 90 minutes. We have to treat him with kid gloves,@ said Warnock.
"I won't play my full team and I am sure Chelsea won't, but they have more players they can rest than we have. I am sure it will be competitive, whatever team I put out."