Sydney FC's marquee striker Marc Janko says winning the A-League championship on Sunday will not have any bearing on whether or not he will remain at the club, with his mind already made up.

The Austrian skipper will not reveal just what his decision is, respecting the club's wishes to put all contract talks on hold until after Sunday's epic title decider against Melbourne Victory at AAMI Park.

Janko, who on Monday received the Golden Boot award for his 16 strikes this season, has been a crucial part of Sydney's best campaign in five years.

He signed a one-year deal worth $1.4 million last year and was offered the same amount by the club over a month ago to stay on for next season.

He says he has made the best decision for his future and insists a win on Sunday will not change is mind.

"That doesn't matter, the decision has already been made. So it doesn't influence anything," Janko said.

"At the moment there's nothing to announce yet but I'm happy and I'm confident with my decision and I think it's the right thing for me.

"We all want to focus on the last game which is very important ... so we agreed to put everything negotiations-wise on hold and we'll continue to speak about that after the last game."

The 31-year-old also looks set to miss the Sky Blues' blockbuster clashes with English Premier League champion Chelsea on May 30 and fellow Premier League club Tottenham Hotspur on June 2.

He is set to wed fiance Nina in Austria in early June before going on international duty for the Euro 2016 qualifiers in mid June.

Janko says he will head back home after Sunday's grand final, making it unlikely he'll return for the exhibition matches at Sydney's Olympic stadium.

But the striker has not ruled it out.

"That's not official yet. We have to also speak about that after the last game," he said.

"We haven't decided anything yet so we'll see."

AAP