Macarthur FC slipped to a 3-1 defeat against the Brisbane Roar on Sunday to leave boss Ante Milicic concerned with the way they are conceding goals.
The Bulls are priced at 10/1 to win the A-League minor premiership but they have slipped down from top of the ladder to sixth place after failing to pick up a win in five games.
Macarthur were top of the pile at Christmas but since returning from an enforced break they have picked up two draws and three defeats to put them in freefall.
Just as worrying is the fact the defence have started to leak goals for fun, with 11 being conceded in the last four matches.
Milicic was far from impressed with the defending on show and says it is something they need to sort out quickly.
"Of course it's a worry but moreso the type of goals that we've conceded the last couple of weeks," Milicic told reporters after the game.
"If you look at the ones that we've conceded they're very difficult to take and to understand but we haven't had any time on the training field in the last week. We need to get better.
"We've changed personnel, changed the formation a bit but in the end we're making mistakes and getting punished for them. We need to really regroup and then start again."
Macarthur are back in action on Saturday when they face Adelaide United and Milicic says there is no time to feel sorry for themselves as they get ready to go again.
"We have to recover first and foremost and see how the boys pulled up," Milicic added. "We've got to review this week. We can't now just put it away. We've got to, I keep saying it in the last few weeks, we've got to learn from it. We've got to get better.
"But it will give us a couple of days on the pitch and hopefully some fresh bodies and work on a few things. We just need a better performance at home against Adelaide."