Fletcher has become an important member of the squad since making his comeback against Aston Villa in mid-December.
"I feel like I'm making up for lost time, to be perfectly honest," he told Inside United. "I always cherished the position I was in and people were saying: 'You should just be happy to be back'. But I never wanted to get in that mindset because I think it's a dangerous mindset to get into, where you just accept a level.
"I always feel that if you put caps on just being happy and settling for stuff, then you can never progress yourself. So I see that I've got a lot of lost time to make up for. I want to try and put those two years on at the end of my career."
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