Former Red Devils defender Gary Pallister, an ex-team-mate of Giggs', says Moyes could be trying to set up something similar to the famous Anfield boot-room.
Back in the 1970s and '80s the 'Liverpool Way' was to promote from within and install managers who had the club very much at heart.
And United will be spoilt for choice with Paul Scholes, now a full-time coach with the reserves after hanging up his boots in May, and Nicky Butt also working at the club.
Pallister, 48, said: "Taking Ryan and Phil on to the coaching staff gives continuity.
"When a club is so successful you want to keep things ticking along without changing things too much."
He added: "Phil has always made it clear that coaching was something he was interested in, so it has always seemed a natural progression.
"With Ryan, maybe it is a bit more of a surprise. I didn't know he was thinking of moving in that direction until it came out he was doing his coaching badges.
"He has a wealth of experience to pass on and he will be able to guide players about how to deal with the trappings of being a superstar while making a huge impact in the game at a very young age.
"He has seen it all in 20-odd years at the club - he has worked with some big characters and under the best manager ever seen in British football."