Popovic, capped 59 times by Australia in a 12-year international career, said he would no longer turn out as a player for Sydney FC but would take up a position as assistant coach with the same club.
"It was a pretty easy decision for me," Popovic told a news conference.
"As an athlete you just know when the time is right and when you are not getting out of yourself what you can. You want to do it but it is just not there anymore."
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