It is said that Ole Gunnar Solskjaer's side are unwilling to part with the name in question, but they may face competition for Diop with it claimed Barcelona and PSG have had scouts to watch the player and that the two European giants have been in touch with his representatives.
Apart from Victor Lindelof, none of the other defenders performed consistently for Manchester United.
Manchester United may be planning their next big swoop during the summer transfer window after securing the services of Daniel James from Swansea.
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Diop joined West Ham United only a year ago, arriving from boyhood club Toulouse in a £22 million deal.
The Red Devils are keen on landing Diop as they look to revamp their defence, but West Ham have taken a strictly not for sale line so far.
Diop, in his only season in the Premier League, has shown enough promise and potential.
Having conceded 54 league goals last season - more than nine of the top ten teams in the Premier League in 2018/19, and Solskjaer has identified the backline of his squad as an area in drastic need of improvement.
Could West Ham sign Anthony Martial from Manchester United?