Jose Mourinho will splash the cash with Champions League football returning to Old Trafford next season.
And according to The Sun, the United boss is eyeing City goalkeeper Hart if David De Gea quits the Red Devils for Real Madrid.
They say the La Liga champions are set to revive their interest in the Spain international this summer.
Real could spend up to £60m on Dea Gea, a world-record fee for a goalkeeper.
And The Sun say Mourinho wants Hart to replace De Gea if he leaves Old Trafford.
Hart, 30, spent last season on loan at Torino after being frozen out by Pep Guardiola.
City signed Benfica stopper Ederson for £35m earlier this month and he’s expected to force Claudio Bravo out of the Etihad.
Meanwhile, Bravo admits he'd love to see Arsenal star Alexis Sanchez at City next season.
He said: "I've said on numerous occasions, he's one of the best players in the world.
"He plays at an incredible level for the national team and an incredible level at his club. He has a great future ahead of him.
"He's always reaching new heights with the national team.
"It's great to see him growing as a player. Of course, I would love to have him as a team-mate.
"But it's not a matter just for the two of us. It's something the clubs have to go through."
