The Spaniard has just one month remaining on his contract, but he is set to sign a new deal before the summer transfer window opens.
Although he is currently the top earner at Old Trafford – on £375,000-a-week – De Gea is expected to accept a huge pay-cut in order to stay at the club.
From July, he is expected to rake in £200,000-a-week – almost half of what he’s been earning for the past four years.
However, according to The Daily Mail, the goalkeeper has stockpiled enough money to cover the losses.
De Gea has gathered £20m of savings in the firm he uses to hold his image rights cash.
The Spaniard runs a firm called Bedamarse Limited to take in payments linked to his name.
De Gea joined Man Utd from Atletico Madrid in 2011 and has since made 539 appearances for the Red Devils.
However, Erik ten Hag is reportedly keen on signing a new goalkeeper in the summer transfer window, so the Spaniard could fall down the pecking order from next season.
United are reportedly interested in signing Dinamo Zagreb goalkeeper Dominik Livakovic.
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The 28-year-old has a £9m release clause which is being considered by the Red Devils.
Ten Hag is also keen on the prospect of signing David Raya from Brentford.
Raya has so far refused to sign a new deal with the Bees, so a transfer could be on the cards this summer.