While there's frustration after the result, Petrovic was happy with the clean sheet.
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Petrovic told the Daily Echo: “Yeah, it was a very, very tough game against a team who is physically very good, and they want to press you, they want to put you in your box and to make you uncomfortable.
“But I think we had as well, a very good game and unlucky we scored that goal that was offside, it was tight.
“And on the end we can be unhappy because we didn't take three points, but again, I think we had a good game against very good team.”
Serb added: “We can be happy because I think we have the best start in the club history, but we are calm and we go through the season game by game, and we are preparing ourselves for every game.”