In the days since David Moyes' sacking as Manchester United manager, the rumour mill has been in full swing in guessing who will take over from the Scot.

One of many names been thrown around is Louis van Gaal, with some claiming he wants to bring former United midfielder and captain Roy Keane as his assistant if he does take over.

Whilst Keane would be another of the 'old guard' coming in to join the likes of Ryan Giggs, Paul Scholes and Nicky Butt, the situation with Keane remains very delicate and United should aim to avoid bringing him in again.

Roy Keane was a brilliant player. An aggressive, determined, midfield masterclass - but his attitude towards his teammates and coaches near the end of his career in Manchester left a bitter taste in everyone's mouth. He and United had several high profile fallouts which have never been resolved and it seems unlikely either one will buck up and apologise any time soon.

The main problem is his relationship with Sir Alex Ferguson, his former manager and now one of the leading board members at Old Trafford.

In his autobiography, Ferguson reveals how Keane was argumentative, aggressive and spoilt - not traits that go down well with Sir Alex. Naturally, the friction between the two got worse, Keane denies all of these accusations to this day and his sale to Celtic wasn't a clean break off to say the least. He has remained bitter in TV Interviews towards his ex manager since.

Needless to say things wouldn't exactly go swimmingly between a highly influential director and the potential assistant manager.

The other major stumbling block would be his relationship with Giggs and Scholes, two coaches who are widely expected to stay on at Old Trafford whatever happens.

Towards the end of his United time, Keane did an interview with club television channel MUTV. In this interview, he slated several of his teammates to such an extent that it had to be pulled from being shown once Ferguson saw it.

Sir Alex showed it to the team and Giggs was one of many to storm out midway through - disgusted at Keane's behaviour. He had lost the respect of all his teammates and coaching staff. After that I highly doubt the 'Class of 92' coaches will want to work with the Irishman again - and even if they do the tension between them would be way too intense. The plan of a smooth running transition would be jeopardised even more.

So, whilst so many United fans would love to see Keane return and show the lacking midfield players some bite, it simply isn't logical. It is imperative the Glazers realise this and look into other alternatives if the idea is brought up by Louis van Gaal.

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