United's Argentine attacker is already a key player under coach Erik ten Hag.
While Diallo is often competing with Garnacho for game time, The Mail states they will have the same representation.
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Garnacho's agent Carlos Cambeiro has nabbed Amad as his latest client this week.
The Ivory Coast star will want to move away from United in the summer for regular game time.
Diallo will either want to leave on loan or perhaps seek a permanent move elsewhere.