Donny Van de Beek has been told he ‘must return to Ajax’ with the Manchester United loanee not part of the plans at the Premier League giants and struggling on loan at Eintracht Frankfurt. If all else fails, then why no re-trace your roots in an attempt to recapture lightning in a bottle? That is the advice coming the way of Donny van de Beek as the Dutchman’s Bundesliga stint threatens to end with a familiar pang of regret. Farmed out on loan to Eintracht Frankfurt after starting only six Premier League games in three-and-a-half years at Manchester United, the much-maligned midfielder’s impac…