Lazio were the better team until Hugo Campagnaro's header salvaged a point for Napoli and Petkovic wants his players to keep their focus for the entire 90 minutes in Germany.
"We know more or less what to expect from Monchengladbach, but that is secondary," ANSA quotes Petkovic as saying. "The most important thing is to find the same Lazio from the first 60 minutes against Napoli.
"In the last few games, as well as early in the season, we lost our concentration. I expect tighter marking, especially in the last five minutes."
Lazio are currently third in Serie A.