Barcelona star Lionel Messi says his biggest challenge now is to win the World Cup with Argentina.

Messi was won everything in the club game.

"I'm lucky to have won so many things with Barça and it would be marvelous to win that title [World Cup] with my national team," said Messi.

"A lot of things have changed recently [in the Argentina national team]. I'm lucky to be able to enjoy everything that happens with the national team."