He had scans yesterday to determine the extent of the issue and hopes that everything comes up clear so he can get back on the pitch as soon as possible.
"I've never experienced any sort of hammy problems before, and I actually thought it was just cramp," he said.
"What I've been told about hamstrings, you know when you've done something really serious, it's like a stabbing pain, which I didn't feel.
"I'm just hoping that it's nothing serious and that I can get back on the pitch as quick as possible."
Thompson had hit some good form in the seven matches since returning from a serious knee injury, scoring on three occasions and providing a few assists along the way.