BRODIE Grundy has signed a seven-year deal to remain with Collingwood.

The ruckman, who was set to become a free agent at the end of this year, will now be tied to the Magpies until the end of the 2027 season. 

The two-time All Australian big man has resisted overtures from Adelaide to return home to South Australia to instead be a Magpie for life.

AFL.com.au reported in November that the two-time best-and-fairest winner was poised to sign the long-term commitment. 

Negotiations saw the offer jump from an initial three-year term to five years before the Magpies bumped it to seven years, which Grundy had always been chasing.

 The 25-year-old said it had taken some time to come to what is an "important decision".

"I took my time to consider all of the things that mean the most to me – my football, my ambitions, my life beyond the game, my family, friends, team-mates and the football club – and settled on what I believe is best for all of those relationships, needs and passions," Grundy said.

"I want to be able to find the very best version of myself, as a person and a footballer, but I also want to contribute to the greater good, to the whole. I know that, in a football sense at least, what 'Bucks' (coach Nathan Buckley) and the group are creating is a cause worth continuing to invest in passionately." 

The Pies' focus will now shift to retaining Jordan De Goey and Darcy Moore, with the young stars both coming out of contract at the end of 2020.

Grundy, who joined the Magpies with pick 18 at the 2012 NAB AFL Draft, will be 33 at the end of his massive deal.

Collingwood list manager Ned Guy said the Pies see plenty of improvement left in Grundy despite his dominance in recent seasons.

 "Brodie is physical in the way he plays the game. He prepares exceptionally well which explains, in part, his durability. He wants to lead, wants to improve, wants to set an example and dominate. He is rarely content with his game," he said.

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"We love the fact that he sees so much scope for improvement and is determined to be as good as he can possibly be even though, at 25 years of age, he is already an influential player on the field and, increasingly, in the change room.

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"If you look at Brodie's performances, he is on an upswing. It will be fascinating, and a joy, to see Brodie's future unfold."

Grundy has played 132 games for the Magpies, and has become a durable member of the premiership hopefuls, not missing a game in his past two brilliant seasons.