There likely isn't a rivalry across sports that was as iconic as Lionel Messi during his time with FC Barcelona and Cristiano Ronaldo during his tenure with Real Madrid.

Two of the best players in the world routinely competing against one another for clubs who happen to hated rivals. Between the two of them they have 13 Ballon d'Or awards, nine Champions League trophies, thousands of goals and a debate regarding who is better that may never be settled.

While it's been multiple years since they have faced off against one another, the possibility surfaced as CBS Sports reported that there has been a push for Ronaldo to play in the Club World Cup . The 32-club tournament is set to take place in the United States from June 14-July 13, and is the first rendition of the FIFA tournament.

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