Del Piero left Juventus this summer after spending his entire career at the club.
Sydney have competition from Swiss side FC Sion, who have also been linked with the player.
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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.