Scholes announced his retirement a fortnight ago.
"If you are going to be a part of this club you have to be available from the beginning and to be able to last 90 minutes," he said.
"When I was starting games I didn't feel great. I didn't mind playing the odd game or coming on at the end of games - it was probably the right way to use me. The best I felt was when I was playing the last 15 or 20 minutes and really that's not right."