Sydney FC have secured the services of goalkeeping coach Zeljko Kalac for another A-League season.The former Socceroos and AC Milan goalkeeper joined at the start of the 2011/12 campaign and has agreed to a one-year contract extension.Western Sydney product Kalac said remaining with the Sky Blues was his top priority, despite a second Sydney team entering the competition from next season."Sydney FC is a great club with great facilities and I have really enjoyed coming to work every day since I started. Staying at Sydney FC was the only option for me as far as I was concerned," Kalac said."I'm really grateful for the opportunity I was given when the position became available at the start of this year and I have enjoyed coaching the A-League keepers as well as the young goalkeepers coming through."Kalac will continue to work with Sydney's No.1 'keeper Ivan Necevski and will help identify a replacement for backup Liam Reddy, who was sacked by the club.Sydney remain on the hunt for a new head coach after Central Coast's Graham Arnold turned his back on a lucrative offer to join the club.The Sky Blues are locked in a race with the new western Sydney franchise to sign former Sydney FC player and assistant Tony Popovic as coach, with the former Socceroos defender expected to make a decision early next week.