The Sydney-born star, widely regarded as the greatest footballer Australia has ever produced, won a Champions League and FA Cup as a Red, although he was substituted due to injury after starting both finals.
The decision to retire was announced at a press conference on Wednesday, where the 35-year-old explained in detail why now is the time to bring the curtain down.
"The body's great - I felt it was the right time to go out on my terms," Kewell said.
"I wanted to be able to finish where I could still do things outside of football, all the things I couldn't do as a footballer. I can do these things now."
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