The 32-year-old is currently starring in the Spanish capital, with a record-breaking transfer in 2009 having taken him from Old Trafford to Santiago Bernabeu.
He could, however, have arrived six years earlier, with Turin another possible landing spot that he passed up once the exit door was opened at Portuguese side Sporting.
Ronaldo felt humbled to be under consideration by some of the biggest club's in world football, but admits that his final decision was swayed by input from his agent and the desire to fulfil a childhood dream.
Speaking to Juve legend Alessandro Del Piero after collecting the Player of the Year prize at the Globe Soccer Awards, the five-time Ballon d’Or winner said: "Many clubs were interested in me.
"But the key man as always was Jorge Mendes.
"He has always guided me in the right direction. Of course, I remember that he talked also about Juventus, and I was happy because they are an extraordinary club.
"He also talked about Real Madrid, Manchester United and many others. But the club that offered me the best conditions were United. It was a dream because as a kid I always wanted to play in the Premier League.
"United gave me this opportunity and for that I have to thank Sir Alex Ferguson and obviously Jorge helped me to arrive there."
Ronaldo’s six years in Manchester delivered 118 goals in 292 appearances, as he helped the Red Devils to three Premier League titles along with FA Cup, League Cup, Champions League and Club World Cup triumphs.
The trophies have continued to roll in during his time in Spain, with two La Liga titles, a further three Champions League crowns and three Club World Cups added to his roll of honour – complementing his many individual awards.
Ronaldo has also sent records tumbling with his remarkable goalscoring exploits, with a 422-goal haul in 416 appearances seeing him rewrite the history books with Madrid and across Europe.