Alex Song was delighted with Barcelona's win over Cartagena in the Copa del Rey.
It ended a losing run of two games for the Spanish champs.
"FC Barcelona is the best team in the world and we are always looking to improve…….but other teams have done their homework on Barça, and winning a game before kicking a ball is impossible," said Song.
"We have to show that we are the best team in the world and win every game."
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