Rashford enlisted Dan Donachie in January as his career began to spiral. The England attacker rediscovered his form on-loan at Aston Villa ahead of making a similar move to Barca this summer.
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The Manchester United loanee struck twice in midweek as Barca won at Champions League opponents Newcastle.
The Sun says Rashford and Donachie are in regular contact, with his form being credited to the latter's influence.
Donachie is the son of former Manchester City player and coach Willie Donachie and also has City defender John Stones among his clients.