Manchester United are preparing for a big-money offer from Paris Saint-Germain for goalkeeper David De Gea, according to ESPN.

The news comes just 24 hours after the French club announced that legendary stopper Gianluigi Buffon will be departing after one year at the club.

De Gea has a year left on his contract and negotiations over a new long-term deal have stalled. United have privately insisted they will not cash in this summer, but there are fears a big-money move from PSG will severely test their resolve.

De Gea has also been linked with Juventus and Real Madrid, but sources have told ESPN FC that United fear PSG pose the most serious threat. There are doubts about whether Juventus could afford the deal while there is a belief at Old Trafford that Real Madrid's transfer priorities lie elsewhere.

PSG, who are also interested in Keylor Navas, have the funds to tempt United with a hefty fee and offer De Gea a lucrative wage packet. The 28-year-old would also be offered the chance to win trophies and challenge for the Champions League.

United have been in contract talks with Spain's No.1, whose form dipped sharply during the second half of the season, for more than a year but terms have not been agreed. As it stands, he could walk away for free next summer.