CNN Portugal reports an unnamed Middle East club have offered the 37-year-old an eye-watering amount of cash to join them.
The club is said to be Saudi Arabian.
The club would not only pay United a transfer fee of around £25m to sign Ronaldo but they would offer him a salary in the region of £105m-per-season over two years.
The lucrative package also includes £20m for Ronaldo’s representative Jorge Mendes.
United paid Juventus an initial £12.85m to bring Ronaldo back to Old Trafford last summer, with the player signing a two-year contract with the option of a third.
The Saudi offer arrives after Ronaldo requested United listen to offers for him last month.