Without investment, Palace could have to sell Wan-Bissaka or Wilfried Zaha...
According to Italian journalist Nicolo Schira, the Red Devils have agreed a five-year contract with the 21-year-old.
The two clubs have been in talks over the transfer for a number of weeks.
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And on Saturday, a grand parade known as the Trooping of the Colour marked the official birthday of the reigning British monarch. The Duchess donned a gorgeous navy design from Givenchy with a hat, peacock blue clutch and emerald-cut earrings.
Aaron Wan-Bissaka broke into the Palace team at the back-end of the 2017-18 season.
"He had a baptism of fire over a year ago now, playing three of the top six teams in his first games".
He believes the 21-year-old's value will only go up over the course of the next year and fears that United could make the same mistake as they did with Harry Maguire whose price has now rocketed to over £90m at Leicester.
Man City, of course, are the reigning Premier League champions, while Chelsea's hopes of signing the Crystal Palace star are now stifled by a transfer ban. "It says I am going to be there, so that is all I can focus on now".
City registered interest as they wanted to put pressure on Kyle Walker, who has had an indifferent season.
The Croydon-born star was named the club's player of the season in April after starring in 39 appearances in all competitions.