In what was a tight affair at Parramatta Stadium on Sunday, Glory pegged back the lead twice before an Aloisi header on 87 minutes saw the Sky Blues secure three points.

Aloisi's first came in much more unusual circumstances, with his low strike cleared over the line by Glory defender Chris Coyne. With the clearance finding a gap in the side netting, referee Chris Beath initially called play on, much to the disapproval of the 8,359 supporters present.

Following consultation with his assistant however the goal was awarded, restoring Sydney's advantage.

"It was a tough game. We probably didn't play as well as we would have liked but it was exciting for the fans and a massive win for us. It keep our top two hopes alive," Aloisi said.

"I was happy to get on the scoresheet but it was more important to get the three points.

"It is a massive game next week and we are expecting a huge crowd. The players can't wait, every footballer wants to play in a big game."

"The team showed great character and it was our experienced players who shone through in the important parts of the game," Vitezslav Lavicka said.

Meanwhile, Sydney FC's National Youth League side were defeated 1-0 by Perth Glory at Seymour Shaw Park this afternoon.

A first half strike from Glory player Brent Griffiths in the 40th minute gave Perth the away win.

The match was moved from Parramatta Stadium to Seymour Shaw Park this morning due to constant heavy rain.