Jose Mourinho did not act on the one transfer that was suggested to him by Sir Alex Ferguson during his time in charge of Man United.
Mourinho became manager of the Red Devils in the summer of 2016 and would go on to spend two-and-a-half years at Old Trafford.
Legendary United boss Ferguson did not offer too much in the way of advice but he did feel strongly that the team should target English midfielder Dele Alli.
Mourinho did not agree but would go on to manage the player at Tottenham.
In a clip from Amazon's 'All or Nothing' series, the now AS Roma manager is seen complaining to Spurs chairman Daniel Levy about Alli.
'I told already Dele very directly that he doesn't train well, he is not a good trainer,' he said.
'I am not saying a disaster, but I am not saying Harry Kane. Harry Kane is a very good trainer.'
Mourinho added: 'Sir Alex Ferguson gave me only one bit of advice in two and a half years: Buy Dele Alli. 'That guy, with that mentality, the way he plays, the aggression he has in mind. This guy is the Manchester United player. Buy Dele Alli'.
'And he [Ferguson] has an eye for a player. But he [Alli] is not a good trainer, we need to find motivation for the guy.'
Alli has not had it easy in the years since those comments were made and has returned to Everton following a difficult loan spell with Turkish club Besiktas.
He hasn't been able to play a single minute of football so far this season due to a long-standing groin issue.
The 27-year-old returned to training last month but revealed in a New Year Instagram post that he'd suffered a fresh setback.
Alli wrote on social media: 'As the year comes to an end, I just wanted to say thank you for the incredible support I've received over the last 12 months.
'This year has been
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