Sydney goalkeeper Andrew Redmayne still has strong support from his coach Steve Corica, who intends talking to him about his recent form slump and a series of "silly mistakes".

Socceroo Redmayne, who was outstanding in Sydney's back-to-back A-League title wins in the last two seasons, has made at least three errors In the current campaign that have resulted in goals.

Against Newcastle on Saturday, the 32-year-old custodian hacked an attempted clearance straight to Luka Prso just outside the penalty area and the youngster advanced and curled the ball around Redmayne for the opening goal.

Sydney fought back to win 2-1, with second half goals from veterans Milos Ninkovic and Alex Wilkinson lifting the Sky Blues to third on the ladder.

Redmayne, the 2019-20 A-League goalkeeper of the year award winner, is far and away the most experienced of the three shot stoppers on Sydney's books.

Thomas Heward-Belle, 24, has played one A-League match and four Asian Champions League fixtures while 18-year-old Adam Pavlesic has yet to make a senior appearance.

Corica holds Redmayne in high regard but is frustrated by his recent errors and isn't sure why his form has slipped.

"Obviously, (Sydney goalkeeping coach) Matt Nash has had many chats with him," Corica said.

"We've got Tommy Heward-Belle and Pavlesic as well, but he's a very good keeper, Redders.

"He's been excellent for four or five years now with us.

"The boys got him out of jail tonight, but he's obviously got to stop making these mistakes.

"I'll have a chat with him next week and we'll go from there, but we need him.

"He's a great player for us and he's brave and he continued to do his stuff in the second half. He's just got to stop making silly mistakes."

Sydney posted back-to-back wins and scored two goals in successive games for just the second time this season.

Newcastle slipped to a third straight loss and remain 11th on the ladder.

"The last few games, little individual errors have cost us and we need to be better in that regard and make sure we are a bit more ruthless in the way we defend at times," Jets' coach Craig Deans said.

"We didn't create enough chances. At the start of the season we created lots of chances and we weren't taking them.

"At the moment we need to get back to creating them and be good enough to take them when they come."

Deans hopes playmaker Ramy Najjarine will be available for next Sunday's home game against Adelaide after missing the last three matches with an ankle injury.