'Great to see you in good shape' - Ronaldo meets up with former boss Ferguson
And, after the five-time Ballon d'Or winner and former United favourite helped Juventus to a straightforward 1-0 victory at Old Trafford in the Champions League, he was reunited with his old boss on Tuesday.
Ronaldo posed for a picture with his one-time mentor, who signed him as a skinny 18-year-old from Sporting CP in 2003.
Sharing the photograph on Twitter, Ronaldo described Ferguson as "a great coach and above all a wonderful man", as well as highlighting the 76-year-old's good health after suffering a brain haemorrhage earlier this year.
"[He] taught me so many things inside and outside the pitch," the tweet continued.
"Great to see you in good shape, Boss!"
Ronaldo will face Group H rivals United again, this time in Turin, on November 7 in the return fixture.
A great coach and above all a wonderful man. Taught me so many things inside and outside the pitch. Great to see you in good shape, Boss! pic.twitter.com/Ql4dcuJvCW
— Cristiano Ronaldo (@Cristiano) October 24, 2018