The Sky Blues’ 15-game unbeaten run ground to a halt with defeat to the K-League outfit, thanks to second-half goals from Dejan Damjanovic.

Sydney failed to register one single shot on target in the game where they were well below their usual standards.

β€œIt’ll be a good wake-up call for everyone, the players, the staff,” Arnold said.

β€œWe’ll have a good look at the game again. Obviously they changed things from what they were playing before, they played with a back five and closed down the space.

β€œWe’ve got to be better than that.”

Arnold conceded his side weren’t themselves and appeared flat.

β€œObviously the opposition is a step-up in quality, we looked a little bit flat,” Arnold said.

β€œWe didn’t take the opportunities to be brave in front of goal. I thought the first half was quite even. Second half, we got stretched a little bit.

β€œIt probably wasn’t our greatest performance but we’ll learn from it.”

Sky Blues skipper Alex Brosque admitted the side battled with Suwon’s tactics.

β€œWe turned over cheap possession,” he said.

β€œThey obviously came here and stacked their defence and tried to keep compact, which they did.

β€œI don’t think we moved the ball around in the right areas. We looked to do that, we spoke about it but we just didn’t do it well enough.

β€œIn key areas we gave the ball away and we weren’t ourselves going forward either.”

Sydney FC face Shanghai Shenhua next week.