The 37-year-old midfielder quit football at the end of last season but has remained at Old Trafford as a coach.
United says Scholes approached manager Alex Ferguson to reverse his decision and will be on the bench at Man City on Sunday.
Scholes says it’s been “pretty clear since I stopped playing that I miss it.”
He added: “I’m delighted the manager feels I can still make a contribution to the team and I’m looking forward to playing my part in trying to bring more success to this great club.”
Ferguson says “it’s fantastic that Paul has made this decision.”
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