The Swedish goal-getter, who joined the Catalan giants from Inter Milan for £43 million last summer, has netted 18 times in all competitions this season.
Ibrahimovic finally broke his duck in the Champions League knockout stages in the previous round of the competition against Stuttgart, having previously failed to net outside of the group phase of European football's premier club tournament.
"I don't think I have performed to my best level when I have played against English teams, but always for Italian teams to play against English ones is not easy," he said in The Guardian.
"For an Italian team, the most important thing is not to concede but where I play now, it's a different philosophy. We always look to score."
"I think Barcelona knew what they were buying. I had five fantastic years in Italy and before that, I played in Holland. The people who know their football know the way I play.
"I don't think I have to demonstrate for anybody. I have won six league titles in a row so I don't know what more I have to prove."
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