Ronaldo and Messi are seen as the two greatest of their generation and have often not seen eye-to-eye.
The Argentina international almost left the Catalan club in the summer and has opened up on exactly what happened.
“I told the club, including the president, that I wanted to go,” Messi said. “I’ve been telling him that all year. I believed it was time to step aside.
“I believed that the club needed more young players, new players and I thought my time in Barcelona was over. I felt very sorry because I always said that I wanted to finish my career here.
“It was a very difficult year, I suffered a lot in training, in games and in the dressing room. Everything became very difficult for me and there came a time when I considered looking for new ambitions.