Kewell was sent off playing for Leeds against Galatasaray in the 2000 Uefa Cup semi-final.
And he scored a goal and helped set up another in Australia's 3-1 win over Qatar in June that guaranteed them a place in the second round of Asian qualifying for the 2010 World Cup.
Kewell, who was welcomed by throngs of supporters his arrival in Istanbul, said he was excited to have joined a club with such a large fan base.
"I know that that fans are passionate about sport and I love that," he said. "I can't wait to get more of it.
"There's a lot of talk about the Turkish league, it's coming up in the world.
"The national team has done well in the last couple of international tournaments and there's a lot of young talent here."
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