He will not play against MK Dons on Saturday, but manager Paul Trollope does not believe the problem to be too serious.
"There doesn't appear to be any major problem with his knee," he told Rovers' official website. "While there are obviously a few issues from previous injuries, there doesn't seem to be anything too acute at the moment.
"We are hoping to send him to the consultant he's seen before to get a second opinion. However, the signs are good, and we are hoping that the consultant gives us the news we are hoping for, because at this moment in time it doesn't seem too severe."