According to the Daily Mail, the player is ready to reduce the salary requirements in order to join the club that will play in the Champions League.
It is noted that Atlético fans oppose his move to the Madrid club.
Ronaldo has made 38 appearances for Manchester United in the 2021/22 season, scoring 24 goals and providing three assists.
Manchester United's contract with Ronaldo is valid until June 2023.
The team finished sixth in the Premier League and will not be able to take part in the Champions League.
Earlier it was reported that Atlético want to part ways with striker Antoine Griezmann in order to sign a contract with Ronaldo.