The high-flying Reds, who face relegation-threatened Ventforet Kofu on Wednesday, have suffered two losses in their past three to have their lead at the top cut to four points by Gamba Osaka.
After his side's 4-2 loss at Vegalta Sendai, Petrovic said it was important to stay positive with six league games remaining.
"Though we lost the match, as the team manager, I don't think we need to view it pessimistically for longer than necessary," he was quoted as saying by the club's website.
"I would rather view it as something that happened in a timely manner before we are to play our remaining six matches.
"We will analyse the cause of our loss in detail so that we can perform better in our upcoming matches. I'd like to regard [the] loss rather positively."
"I felt our team was not able to play our style of collective soccer. I thought each player played relying too much on what he thought best," he said.
"However, that is not how our team plays our style of soccer.
"Our style is for each player to share a common understanding about how we wage attacks against our opponent team. But, this was what we were slightly lacking."
