The 24-year-old has been the subject of intense interest from Real Madrid all summer and the Reds have so far fended off the La Liga giants.
They have demanded a world record fee of over £35m for the 24-year-old and want Madrid captain Sergio Ramos involved in the deal if United are to let de Gea leave for the Bernabeu.
He's had just 90 minutes football on the tour of America and though he was superb against Barcelona in Santa Clara his first half display against Paris St Germain was error strewn.