The dynamic midfielder, 26, is on United’s wish-list as David Moyes plots to rehaul his squad.
But the Premier League champions will face stiff competition from Real Madrid, who are also back on the trail of the 45-cap Chile international.
Carlo Ancelotti wanted to raid his old club Juventus for Vidal last summer but the player’s high price-tag, coupled with the Bernabeu giants’ big-money moves for Asier Illarramendi and Gareth Bale, made the transfer impossible.
Real also reportedly established a first-refusal option with Borussia Dortmund for Ilkay Gundogan, which will be effective from June, but they have turned their attention back to £40m-rated Vidal ahead of next season.
Written by Steve Milne @stevenmilnelive