The Saudi Arabian side Al Nassr has signed the Portuguese player.
The Portugal captain left Manchester United after an interview in which he criticized the club.
Ronaldo will reportedly receive the biggest football salary in history at more than £177m per year.
He wants to experience a new football league in a foreign country.
The signing of Al Nassr was described as history in the making.
The club said it would encourage boys and girls to be the best version of themselves.
In the summer, a deal to join Al Hilal in Saudi Arabia was turned down byRonaldo because he was happy at United.
In an interview with Piers Morgan in November, the forward said that he felt betrayed by United and that he was being forced out of the club.
11 years after he left United to join Real Madrid,Ronaldo will return to the club.
He had just over seven months left on his contract with United, but he left immediately.
He was banned for two domestic matches after he knocked a phone out of a fan's hand at Goodison Park.
He will serve the ban at domestic level with any new club he starts in England or abroad.
At the World Cup in Qatar, where he played for Portugal, he became the first man to score at five different World Cup tournaments with his strike in his side's opening win.