Nicol believes the Leicester City star could stagnate his career at Old Trafford, in a similar vein to Paul Pogba.
"The big guns of Manchester United come calling for you and it's only a matter of, can the two clubs sort it out financially? That's what used to happen.
"The bottom line is, is it going to benefit this guy going to United right now? I don't think it would. I think it would help him to keep playing in the way he has at Leicester.
"The way Leicester play suits his game and in fact the way they play is a lot closer to what the likes of City and Liverpool do, than what the likes of United do.
"Because right now, going to Man United, I think is pulling people under. I think for his game, it's not going to help him going to Man United.
"If Paul Pogba can go to Man United and his game suffers, with the experience he has, why wouldn't it happen to James Maddison?"