According to journalist Pedro Almeida on Twitter, the players played together in Real Madrid, so Ronaldo does not want to leave Manchester United.
According to media reports, Casemiro will receive €413 thousand a week in the English team.
The transfer amount will be about €60 million. The contract was signed for four years with the option of extending for one season.
The 30-year-old Brazilian joined Real Madrid in 2013.
In total, he played 336 matches as part of the cream, in which he scored 31 goals and gave 29 assists.
Earlier it was reported that former Manchester United goalkeeper Peter Schmeichel spoke about the transfer of Casemiro.