De Gea has been backed to join Real Madrid after missing out on a transfer in 2015.
Manchester United were only able to hold onto their star asset on that occasion due to a faulty fax machine.
De Gea then penned a four-year extension and has since helped the Red Devils mount a challenge for the top four under both Louis van Gaal and Jose Mourinho.
Five most likely summer deals according to the bookies
Wed, February 1, 2017
Express Sport takes a look at the five most likely deals that could happen this summer. Odds provided by BetStars
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Griezmann to the Premier League – Man Utd 15/8, Chelsea 6/1, Man City 8/1
Real Madrid are desperate to sign Manchester United star David De Gea
Manchester United have a plan to hurt Real Madrid
Despite that, reports in Spain yesterday suggested his girlfriend Edurne was house hunting ahead of a summer departure.
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And Spanish outlet Don Balon claim that Mourinho has told his former club to forget about a summer move for De Gea.
But, should they ignore him, the United manager has a plan to make them regret it.
Kylian Mbappe is one of Europe's rising stars
Madrid's top summer target is said to be Monaco hitman Kylian Mbappe, who has scored 19 goals in 32 games this season.
Should the Spanish giants try and poach De Gea, then United will go all out to ensure they sign France football's latest star.
Mbappe is also wanted at Old Trafford and, despite the transfer of Antoine Griezmann reportedly close to completion, Mourinho could up his interest to hit back at his old employers.