Gokhan Inler has warned Borussia Dortmund that they will see a "completely different" Napoli ahead of Tuesday's Champions League clash with the German giants.
Rafael Benitez's men slumped to a shock 1-0 defeat to Parma in Serie A on Saturday, prompting concerns that the Partenopei's domestic woes could spill over into their European ambitions this week.
The Italian outfit could potentially eliminate last season's beaten finalists depending on how Arsenal - who lead Group F - fare with Marseille.
Inler believes that it would be a mistake for Jurgen Klopp's men to read too much into their loss to the Crociati, promising a significantly improved performance at Signal Iduna Park.
Speaking to reporters, the Switzerland international said: "Parma have closed down well in all areas but we have to be more ruthless. We weren't able to open the game up and so Parma has had an easy time of it.
"It will be a completely different game and a whole other Napoli [in Dortmund]. We have to make sure we get back to our best."
The German side are also forced to prepare for Tuesday's encounter on the back of a defeat, with the Bundesliga giants losing 3-0 to bitter rivals Bayern Munich on Saturday.
The clash in Dortmund is scheduled to kick off at 7:45pm.
