Sydney have won the race to sign Adelaide forward Kurt Tippett, whose future at the Crows had been under a cloud for months.
The 25-year-old has agreed a conditional four-year deal with the premiers.
The key forward had turned down a new deal with Adelaide, and had looked likely to move back to Queensland, where he grew up.
Tippett announced on Tuesday that he was leaving Adelaide where he had played 104 games and kicked 188 goals, and Collingwood prepared to move in.
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But he explained that the Swans had won out for a number of factors.
The deal with Sydney is subject to a trade being agreed.
"It would have been easy to accept a generous five-year offer to stay in Adelaide, or something similar from the Gold Coast or Brisbane, and I also want to thank those clubs for their interest," Tippett said.
"But this was a combined football/lifestyle decision and the balance between the two.
"I was born in Sydney, I have a lot of friends and family there, and this offers me a chance to play football in a lifestyle which I really enjoy.
"Watching the AFL Grand Final last Saturday, listening to the commentary and talking to various people over time, it is obvious the Swans have a very special culture, in addition to a very good team.
"I look forward to being part of it, and playing a role in a team that can be in the premiership mix next year and beyond."
Sydney are 6.50 to win the 2013 Grand Final, with Collingwood 8.50.