Just days before their teams square off in the first leg of the minor semi-final on Friday night, Farina and McKinna expressed their sadness at Kosmina's demise and warned Sydney's new owners they could face further pain.

Czech Vitezslav Lavicka will become FC's fifth coach in as many seasons after Kosmina was shown the door on Saturday following his failure to lift the Sky Blues into the playoffs for the first time in the club's history.

"It's sad to see Kossie go. When the new owners came in I thought they might try and stabilise things but obviously they've decided it's time for a change," McKinna told Sportal on Monday.

"That's up to them - they run the club the best way they see fit and bring in the coach they see fit to do the job – but I'm sure the game will be the poorer without Kossie there."

"Melbourne, Adelaide and us have had stability and those three teams have been successful."

"I'm sure if Kossie was given time and had his own team and brought his own players in he could have done a good job next year, but he's not going to be given that opportunity."

Farina, who is a former team-mate of Kosmina at club and international level, also accused Sydney of jumping the gun.

"Kossie's a good mate – I've known him for a while – and it's unfortunate but that's been Sydney for the last five years," Farina pointed out.

"They've chopped and changed their coaches."

"Every club needs stability. Teams like Central Coast and Melbourne have had that."

"Central Coast have played in two grand finals, Melbourne have won it and are in Asia, so I think stability is a platform for any club to build results."

FFA CEO Ben Buckley has been monitoring the Kosmina saga and suggested Sydney desperately needs to start showing faith in whoever is at the helm.

"I think it's important that all clubs find their equilibrium and become stable operations both on the field and off the field," he said.

“We would hope that all clubs in the A-League can achieve that over time and I guess if you look at the most successful teams in the competition they have found, to some degree, that stability."

"You have to also put that in context. The competition's only four years old and clubs are still trying to develop plans and programs and work out what works and doesn't work."