"I'm on holiday for a week or so and then I'll decide my future," the 29 year old told Fox Sports after leading the already-qualified Socceroos in their 1-0 loss to China in a dead World Cup rubber at Sydney's Olympic stadium.
"But for now I'm just going to relax."
Kewell said he was "in no hurry" to make his mind up amid media reports linking him to Italian club Roma.
"In this day and age, clubs take their time," he said. "There's a long way to go and a big process to go through, so I'm in no rush." Asked if his performance might have helped secure his future, Kewell replied: "You know what? I never came here to prove anything to anyone.
"The only person I really wanted to prove anything to was my old manager (Liverpool's Rafael Benitez), just to show him I can play.
"Other than that I didn't want to prove anything, I just wanted to go out there and enjoy myself."
Kewell raised hopes that he might be one of three over-age players allowed to compete at the Olympics when he said it had always been a dream of his to feature at the Games.
"I've been injured the last two times," he said. "I've got to sort my club future out first and if the opportunity arises then - yeah, maybe.
"The Olympics is only two weeks but I've got to sort my future out first."
Kewell was coy about a possible move to Italy's Serie A.
"It's a beautiful city. I've been there once when I was younger."