For Real Madrid fans, Barcelona legend Lionel Messi will be seen as an eternal enemy.

The two clubs have the biggest rivalry in the history of football, and in the modern era, Real Madrid legend Cristiano Ronaldo has been seen as a major rival for Messi.

The two players have often competed against each other, and have rivalled themselves as the greatest of all time.

Messi and Ronaldo had won every trophy available, bar the World Cup. But Messi changed the course of history as he captained Argentina to win the World Cup – a feat Ronaldo may never match as he may never win the World Cup.