Ronaldo signed for United in 2003 and won seven major honours at Old Trafford.
Ronaldo has managed six goals and two assists in 15 career appearances against Arsenal.
However, Arsenal may have come closest of them all, as the Juventus star says he very almost moved to north London early in his career instead of Manchester.
Messi topped his rival in La Liga titles, with the Argentina star winning the league 10 times.
"I remember one day I was at home in the living room with my girlfriend watching the television to see the news and they speak about 'Cristiano Ronaldo this and that'".
"It motivates me. If you're not motivated, it's better to stop". "They're a great club".
The young England worldwide left Manchester City to join the Bundesliga giants but Wenger admitted he also tried to "lure" Sancho to the Emirates.
"I wanted to take him from Man City when he didn't get the games", he said.
"It didn't happen, but Arsenal, I appreciate what they did for me, especially Arsene Wenger, but football you never know where you are going to play, life is like that. He can dribble, he has the arrogance".
In an interview with Piers Morgan on ITV, the Portugal superstar gave his version of a story that had previously been told by former Arsenal manager Arsene Wenger, who revealed Ronaldo had been at the Gunners training ground for final talks over a move to the club when he left Sporting Lisbon.
A week earlier, Ronaldo scored four goals for Portugal in a 5-1 win over Lithuania.
"I tried many times but I never succeeded".
"I just changed the channel for Cristiano Jr not to see that they speak bad about his father about a very bad case".