Ronaldo also confirmed the move, saying the years spent at Real Madrid "were probably the happiest of my life".
"I can only give enormous thanks to this club, these fans and this city". I feel that way and I ask everyone, and especially our fans, to please understand me.
Ronaldo scored four goals to take his tally to 85 for his country and break Ferenc Puskas' record as Europe's all-time leading global scorer.
Cristiano Ronaldo is set to join Juventus from Real Madrid.
We have worked over the last few years to ensure our League is above players and clubs, vry much in the style of the Premier League.
Ronaldo, though, helped Real re-establish their status as the most feared club on the continent, ending their 12-year wait for the Champions League by winning it in 2014 and then leading their remarkable run to three successive triumphs, taking their European Cup count from nine to 13.
Real Madrid captain Sergio Ramos saluted Ronaldo's achievements, tweeting: "Cristiano, your goals, your numbers and everything we've won together speak for themselves". "For Real Madrid, Cristiano Ronaldo will always be one of its greatest symbols and a unique reference for the next generations".
44 - hat-tricks for Madrid including a club-record 34 in LaLiga.
Real paid tribute to Ronaldo, who is the all-time top scorer in the Champions League, in a lengthy statement on their website and said the player had asked to be transferred. I just know how huge the club is and the mentality of the club - they want to win titles.
In the latter part of Boniperti's time at Juventus, the club signed an overseas player whose goal-scoring exploits would become legendary. They make everything work and they are tirelessly watching every detail. My respect and my recognition goes out to all of them.
I have reflected a lot and I know that the time has come for a new cycle. I am leaving but I will always feel that this jersey, this badge and the Santiago Bernabéu are mine, no matter where I am.
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