The Swiss resume their group schedule Friday against Serbia, who entered the day leading Group E after a 1-0 victory over Costa Rica in their first game of the tournament. "That's not enough; we have to play better against Serbia", Petkovic said through an interpreter.
The Serbia forward amassed four shots against Costa Rica without scoring, having netted five goals in as many worldwide appearances in 2018.
Head coach Vladimir Petkovic could name the same side that drew 1-1 with Brazil, with Haris Seferovic continuing as a lone forward.
Head coach Mladen Krstajic is not expected to make major changes but he could hand winger Filip Kostic a start. "I did it, and we don't have to speak about this".
Imperious in the air, Mitrovic has been sensational since the turn of the year, and this evening the bullish marksman demonstrated exactly why he has received such widespread praise in recent months. After nearly putting his side ahead with a curling strike that clipped the woodwork, the Swiss livewire scored the goal his performance deserved in the final minute of normal time.
Xhaka struck the Swiss equalizer in the 52nd minute before Shaqiri scored a late victor when he broke free from the half-way line to slot past Serbian goalkeeper Vladimir Stojkovic.
"I guarantee you my players will take responsibility, be aggressive and on top of the other team", Krstajic said Thursday.
One sub-plot to watch out for could be the Serbian fans' treatment of Switzerland's three players with links to Kosovo.
Another late victor: Xherdan Shaqiri pinched the game for Switzerland.
Serbia went in front in the fifth minute when Aleksandar Mitrovic, after missing a header moments earlier, rose above a Swiss defender and wonderfully guided a Dusan Tadic cross from the right past goalkeeper Yann Sommer and into the far corner.
Neither coach would be drawn on the issue Thursday, with Krstajic saying he is "not interested in politics".