Despite his impressive displays to help Los Blancos claim their 10th European Cup last term and some good showings at the World Cup, he is rumoured to be available following James Rodriguez and Toni Kroos’ switches to the Bernabeu.
Paris Saint-Germain were though to have had a deal all but wrapped up, but the Ligue 1 champions have had to stall in a bid to get cash in to be compliant with Financial Fair Play regulations – with some speculation suggesting they are actually now out of the running.
This has left the door ajar for United, who have responded with a massive £55m offer.
Louis van Gaal is thought to be a big fan of the South American, and sees him as a good addition to his ranks as he plots to bring the Premier League trophy back to Old Trafford.
United are also tracking Arturo Vidal, and may offer in excess of £40m for the Chilean.