"If we continue like this, with this attitude and performance, the only thing I can assure you is we won't even tickle Barca in the Champions League," Napoli's coach Gennaro Gattuso told Sky Sport Italia after the 2-1 Parma loss.
He added: "We're making too many mistakes and our opponents are punishing us. It's happened a lot of times now and we must correct that because it's causing us too many problems."
Napoli have suffered just two defeats in 11 games since the Italian football returned to action, also winning the Coppa Italia final during this run.
Barcelona face Napoli in the return leg of the Champions League round of 16 on August 8 after drawing the away game 1-1 in February.
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