Very few reasons for Unai Emery to leave Aston Villa for Manchester United

This afternoon, shortly before 4.30, Unai Emery will leave the tunnel at Old Trafford and walk along the touchline towards the bench.

Will he glance around the grand old stadium – faded and leaking though it may be in parts – and think that he could have a part in restoring the club to former glories? Will he look at the home bench and imagine himself sitting there – or perhaps more plausibly, scuttling up and down in front of it – as the first Manchester United manager since Sir Alex Ferguson to land a league title?