Scholes retired at the end of the previous campaign having helped the club to a 13th Premier League title in Sir Alex Ferguson's last year in charge, but United have struggled since David Moyes took charge.
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"I don't think the manager can legislate for the amount of injuries he has had to deal with," he told the club's official website.
"We've missed [Wayne] Rooney and [Robin] van Persie for big chunks of the season. They are two of the best centre-forwards in the world and any team would miss them.
"When we finally got them both back for the game against Stoke, suddenly we had four centre-halves not fit to play.
"It's been a crazy season for injuries. Hopefully we'll get a bit of luck with injuries and I'm sure if we get all our players fit we'll get moving up the league."