The Scotland international has been away from the game with a bowel condition, but has admitted that he is working with doctors to hopefully allow him to play again next term.
“I’m still not ready to come back playing or training yet but I’m listening to the medical people and trying to get myself right,” Fletcher told BBC Scotland’s Sportscene programme.
“The challenge and the focus is to be ready for next season.
“Me and the medical team decided it’d be best if I tried to get myself right and take an extended period out from the game; then come back fully fit and ready to play.
“It’s an unpredictable illness and you don’t know what lies ahead of you. But I’ve got to keep staying strong and keep believing. That’s an important side of it: positive thinking.
“I’ve received great support from everyone in Scotland and down in Manchester. I’m hopeful and really positive that I’ll be back and back to my best,” he concluded.
By Gareth McKnight