The 34-year-old signed for Heart in June to end what was effectively a season out of the game after leaving Melbourne Victory to return to England for family reasons in 2012, with his only playing time this year coming via a three-game guest stint at Qatari club Al-Gharafa.
 
Now permanently back in a professional set-up, Kewell says he's feeling fresh and pumped for his second campaign in the A-League.
 
Kewell's first game for Heart will be against Victory on October 12 in what is sure to be one the most fierce Melbourne derbies to date given his decision to join his former side's cross-town rivals.
 
However, the hostile reception he is sure to receive from Victory fans won't bother Kewell, with the forward giving his previous employers this ominous warning.
 
"Why would they boo me? I went for family reasons. You know what, the more they boo, the better I play," Kewell asked SEN.
 
But, while the thought of Brazil remains in the back of his mind, Kewell understands he must rediscover his form at club level before thinking about a return to the Socceroos set up.
 
"As a footballer, as a person you just want to go there because it is going to be amazing," said Kewell.
 
"But I think first and foremost, I've got to play well for Heart and if you play well for your club then you have a chance to play for your country.
 
"If you're not playing week in week out for your club then you'll have no chance."
 
The former Leeds and Liverpool star last played for Australia in a World Cup qualifier against Saudi Arabia in early 2012 but missed out an selection for the recent East Asian Cup in South Korea, where a mostly untested Socceroos squad finished last in a finals tournament consisting of Japan, South Korea and China.
 
While conceding it was disappointing not to be with the team for the tournament, Kewell believes Osieck made the right call in not selecting him due to his lack of playing time in the last year.
 
"He (Osieck) knows that I'm playing for Heart, he knows what I'm capable of doing but I think he made the right decision," Kewell said.
 
"I wasn't ready to play in these games and as much as I want to play, it's a privilege to play for your country, but I think he made the right decision.
 
"The only thing I can do now is not only prove to myself but prove to the nation that I'm ready to step up and go to Brazil but first and foremost my job is for the Melbourne Heart."
 
The veteran also gave a glowing assessment of the growth of football in Australia, pointing towards the attention surrounding the recent tours by Manchester United and Liverpool as proof of the game's continued rise in what is one of the toughest sporting markets in the world.
 
"I can feel the wave. I mean, I think if you look at the stats from (ages) 10-14 it's the most played sport in Australia, football. You know, all kids want to do it so there is a massive following for football," he said.
 
"To see what happened at Manchester United and Liverpool, it didn't surprise.
 
"They're two of the greatest clubs in the world and I think it's great because it's actually opened the door now and I think other Premiership clubs, even maybe Spanish clubs and Italian clubs, may be looking at this and thinking, 'well, this is only a pre-season game but we can get 95,000 people, we want a bit of this'. So I think you're going to see a lot more teams now."