United won the competition last season after a penalty shoot-out success over Chelsea.
“We were sitting in the dressing room and there were so many players already talking about winning it again,” Fletcher told the Daily Mail.
“Gary Neville, Rio Ferdinand marching around telling everybody, ‘I like this feeling, let’s keep it going’.
“That’s why the club gets stronger and stronger. I know nobody has retained the Champions League, but we are definitely capable of it.
“If we do not at least get near it, the club will see that as a disappointment, just as were disappointed we didn’t do the Treble last year.
“We always think we can achieve more. Look at Ryan (Giggs). I’m sure he sees the Premier League trophy as his trophy and why shouldn’t he?
“He has won it so many times it’s as if he lends it out for the odd year.”
