Barca went into the game at the Nou Camp having won just one of their previous four league and cup matches and seven points adrift of leaders Real Madrid, who play rock-bottom Levante this weekend.
Teenager Krkic, who netted his team´s second goal in the thrashing, said: "We needed a big win like this. Now if we get through the Copa del Rey tie against Sevilla, it will give us a lot of strength."
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