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And one moment that summed up their relationship was in August 2019 when the two titans of world football were sat together at the Champions League draw in Monaco alongside Virgil Van Dijk - the winner of the UEFA Men's Best Player award that evening.
The pair were seen enjoying each other's company throughout the ceremony in Monaco and Ronaldo had some great words to say about Messi live on BT Sport.
He also extended an invitation for Messi to join him for dinner one day in the future and it just showed the incredible respect there is between the pair.
"We have not had dinner together yet, but I hope so in the future." :raised_hands:
The night Lionel Messi and Cristiano Ronaldo sat down next to each other and just had a chat...
Tomorrow, they share a football pitch together once again :pray:pic.twitter.com/HbicSaS6NW
- Football on BT Sport (@btsportfootball) December 7, 2020
Loved that interview session with Messi and Ronaldo. We should be glad to have witnessed them for so many years and hopefully years to come :top::soccer::clap:
- John Arne Riise (@JARiiseOfficial) August 29, 2019
"I shared this stage with him (Messi) for 15 years," Ronaldo said.
"I don't know if it has ever happened before in football - the same two guys in the same stage all the time. Of course we have a good relationship - we have not had dinner together yet, but I hope so in the future.
"We have that battle, he pushed me and I pushed him as well. It's great to be a part of the history of football. I am there, and of course, he is as well."
Speaking in Spanish about Ronaldo raising his game, Messi added: "It was nice to have Cristiano in La Liga, especially since he was at Real Madrid."
After their dazzling battles on the pitch during El Clasico, Juventus forward has even urged Messi to join him in Italy.
Two years on from their last meeting, the two greats will line up opposite one another again in the Champions League at the Nou Camp on Tuesday evening as Barcelona host Juve.
Given they won't be around playing forever, it's certainly not a spectacle you want to miss.
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