The move puts an end to Ronaldo's nine-year tenure at Real Madrid, during which time he won four Ballon d'Ors and three Golden Boots.
"But I think the time has come to open a new stage in my life and that's why I asked the club to accept to transfer me". I ask everyone, and especially our fans, to please understand me.
Ronaldo was Real Madrid's all-time top scorer with 451 goals in all competitions and won two La Liga titles, four Champions League trophies with them. In total, he won 16 titles, including four Champions Leagues, three of which came in consecutive seasons and four in the last five years.
The five-time Ballon d'Or victor has been Real for nine seasons after joining from Manchester United for a then world-record fee of £80m.
"We don't know who is being lined up, be it Kylian Mbappe, Eden Hazard or Harry Kane".
Ex-Real Madrid striker Michael Owen described the transfer as "unbelievable" and suggested that Ronaldo's arrival would lift Juventus' profile even further.
The World Cup in Russian Federation may serve as a changing of the guard at the highest echelons of the sport, with Real Madrid forced this week to deny it made bids for both Mbappe and his Paris Saint-Germain team-mate Neymar.
Juventus were made aware a few weeks ago that Ronaldo might be available on favourable terms.
Manchester United are interested in taking Bale back to England and his agent was scheduled to meet Real Madrid president Florentino Perez to discuss his future.
"Beyond the (titles), the trophies achieved and the triumphs achieved during these nine years, Cristiano Ronaldo has been an example of dedication, work, responsibility, talent and improvement".
But he hinted his time at the Santiago Bernabeu could be up immediately after the last Champions League success and Juventus captured his signature. The 27-year-old might not be a direct replacement for the prolific Ronaldo, having scored 17 goals for the Blues last season, but he provided more assists than the Portuguese, with 13.
Lewandowski set a European record of 16 goals in a single World Cup qualifying campaign ahead of the tournament in Russian Federation, and scored in nine out of Poland's 10 games.
Becomes first player in Champions League history to score 100 goals as he scores a hat-trick in the quarter-final second leg against Bayern Munich in April 2017.