Sidibe, who has recently come back into first-team contention following seven months out with a cruciate knee ligament injury, pulled his left hamstring in the opening minutes of last night`s reserve match against Chelsea, which the Potters went on to win 3-2.
The 29-year-old Mali international was substituted as a precaution and could now face a further spell on the sidelines.
Reserve team manager Mark O`Connor told the Sentinel: "He wanted to be strapped up to go back on, but there was no way that was going to happen. There was no hesitation in my mind to take him off.
"He has been out for a long time and there's no point rushing him. If he's not involved at the weekend, then we have a two-week break after that before we play Portsmouth.
"He's done fantastically to come back. He wants to play and wants to be out there. But you have to use your head a bit, and we can wait."