Pep Guardiolas champions strolled to a 3-1 win at the Etihad to extend their lead over eighth-placed United to 12 points and Mourinho insisted that his players were still fatigued from their victory over Juventus.
In contrast, Mourinho claimed that Manchester City had played two friendly matches beforehand against Southampton and Shakhtar Donetsk in the Premier League and Champions League respectively.
However, Sutton believes Mourinhos comments are utter rubbish, emphasising instead the gulf in class between the two sides.
United were outclassed. It was like watching Manchester versus Manchester reserves, Sutton told BBC Radio 5 live.
There is an enormous gap between them and City, and things arent going to change unless they change the manager.
What was most galling for me were Mourinhos comments after the game – kicking off, behaving like a big baby. When is it going to stop?
Mourinho made no secret of his desire to sign a central defender in the summer but Sutton sees no reason why Uniteds board would trust the Portuguese with more money in January.
Mourinho has been banging on about money but is Uniteds form this season acceptable on the back of last year? the former England international added.
Hes been talking about how much City have spent but they have to catch Watford and Bournemouth first.
And when you look at the signings he has made, how many have actually been a success?
Has he spent the money well? I dont think so. Why should the United board trust him to spend well in January?