On Tuesday, Ferguson visited Man United's training ground Carrington just two days after the loss to Liverpool.
Speaking on ESPN, Nicol slammed the decision of United's former manager to visit the club's training ground after losing to Liverpool.
Nicol argued why Ferguson's visit undermined Solskjaer as manager, and why the United boss should be “disgusted".
“I absolutely hate the fact that Ferguson is at Carrington. That's horrible, that looks really bad on the manager.
“That's almost like the teacher coming to remind the pupil of what to do, I think it's bad timing.
“If Fergie wants to go to Carrington, why not go after they've won three or four on the trot, which might be a while.
“You don't turn up when all this is going on, it makes it worse for Ole.
"It diminishes Ole's role, he's supposed to be the man.
"Can you imagine Alex Ferguson when he was a manager at Manchester United when they were having a bad run and all of a sudden Matt Busby walks out onto the training ground - Fergie would have gone absolutely ballistic.
“I don't like that at all, that smells awful. If I'm Ole, I'd be disgusted with it.
“If I'm Ole and it's me, I've got something to say.
“The reason Ole is in the position he is is because I don't think Ole actually gets worked up, loses his rag, goes crazy, tells people what they should and shouldn't be doing; because that's what he should be doing now.
"He should be telling Alex and whoever sent Alex down there: 'Excuse me, we don't need you here'."
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