Giggs considered retirement last season during a frustrating spell out of the team but has remained part of Sir Ferguson's squad throughout and could make his 900th appearance for the club in Thursday's Europa League clash with Ajax.
And he told the Daily Telegraph: "When to retire is difficult. Do you quit too early or go that one too many games and let people see you on the slide? Retirement is just a decision that I have to take my time with because I feel different after each game.
"He (Scholes) was missing it and it's no secret that me, (Gary Neville) and a few other people felt that he had finished too early, but who where we to know?
"We wanted him to carry on but he'd made his decision quite early and it was probably too early, which I think he accepts now. Who knows? Maybe he'll carry on next year."