Carrick was appointed to replace the sacked Ruben Amorim and has overseen the formation of a new coaching set-up at Old Trafford.

The group includes former England assistant Steve Holland, Carrick's former Middlesbrough No 2 Jonathan Woodgate, retired defender Jonny Evans and Manchester United Under-21s boss Travis Binnion.

However, Keane was unconvinced by the collective pedigree of the appointments. During a tense discussion with Gary Neville, he challenged the overall balance of the coaching team and dismissed suggestions that Holland's background automatically elevates him to "guru" status.

Keane also took aim at Evans' inclusion, highlighting his lack of prior coaching experience as a concern at a club of United's stature.

The debate between Keane and Neville was combative throughout, although it was punctuated by brief moments of humour amid the sharp exchanges. Neville sought to defend the appointments by pointing to continuity and familiarity with the club, but Keane remained sceptical.

Evans' role in particular drew attention, given that he left his position as Manchester United's loans and pathways manager in December, only to be rehired a month later in a more senior and prestigious capacity within the new coaching structure.

"He's on the beach two weeks ago Jonny Evans. Jonny Evans leaves Man United four or five weeks ago as a loans manager and then Darren Fletcher gives him a job, strangely enough gives him a job," Keane said on the Stick to Football podcast.

"He has two games, Fletch goes and Carrick gives him a job, great isn't it. We should all go to Barbados for a week.

"You're on about getting your coaching staff in, you're praising one of them saying he's experienced and then we just let the other two go, Jonathan Woodgate and Jonny Evans. What has Jonny Evans done to be a coach of Man United's first team?

"He left the job four weeks ago - loans manager and ironically comes back working with the first team. That's a big step up isn't it?"

Roy Keane blasts Man Utd's coaching appointments under Michael Carrick