Sydney FC are determined to return to their miserly best in Saturday's A-League derby, after conceding two goals for the first time in 21 competition games since January.
Sydney.only leaked 14 goals in 34 league and Cup matches last season, but were breached twice in Sunday's 3-2 home win over Wellington.
"We're not used to to conceding and we don't expect to concede two goals in a game," Sky Blues' defender Michael Zullo said.
"That's something we want to improve next week and I'm confident that we're going to do that."
His fierce first-time left foot strike gave Sydney a 2-0 lead against Wellington and was only his third goal in just over 150 senior appearances, spanning a little bit over ten seasons
Zullo's first goal was also against Phoenix, for the then Queensland Roar, on his A-League staring debut in 2007 and he managed one the following season against Melbourne Victory.
The goal was his first in over nine years after he went scoreless over that period for his last three clubs, Utrecht in the Netherlands, and local sides, Adelaide United and Melbourne City.
It was just as well he immediately pounced on a loose ball and lashed it home, as the referee was poised to award a penalty for a push on Sydney captain Alex Brosque, but played a momentary advantage.
"I heard there was going to be a penalty, so it (playing advantage) was a good call from him," Zullo said.
"If he had took that away I would have been ropeable."
The club remains hopeful Polish international winger Adrian Mierzejewski will recover from a hamstring issue in time to play against Western Sydney Wanderers at Allianz Stadium.