Beaten AFL grand finalists Hawthorn has snared the big-bodied key defender it has been lacking, recruiting two-time All-Australian Brian Lake in a trade with the Western Bulldogs.

The Hawks gave up draft picks No.21 and No.41 in return for Lake and pick No.27, to strengthen a defence that was dominated by opposition big forwards Travis Cloke and Kurt Tippett during the finals.

In other deals on the trade period's opening day:

■ Essendon's Angus Monfries joined Port Adelaide in exchange for pick No.48.

■ Gold Coast was given the right to draft highly-rated 17-year-old Western Australian Jack Martin in exchange for giving Greater Western Sydney its No.2 national draft pick, as well as a swap of lesser picks.

■ St Kilda recruited 21-year-old key forward Tom Lee from WAFL club Claremont in a deal that delivered the Giants draft pick No.12, while the Saints also received picks No.24 and No.43.

Lake has played 197 games with the Dogs and was their best and fairest in 2007 and an All-Australian in 2009-10.

Given he will be 31 next season and become eligible for free agency at the end of it, the rebuilding Dogs were delighted with their end of the bargain, which leaves them beautifully placed for next month's draft.

The Hawks were delighted to gain a quality backman who is bigger than Josh Gibson and Ryan Schoenmakers.

''His experience will be highly valuable to our group of relatively young defenders and he will add greatly to our side's depth,'' Hawks football manager Mark Evans said.

For his part, Lake is happy to get the chance to finish his career with a top side.

''We get back into the first round again with another pick and they get a player who can essentially maybe help them go that step further and win a premiership,'' Dogs list manager Jason McCartney said.

Sydney began negotiating to get Adelaide star Kurt Tippett but didn't get far, although Sydney chief executive Andrew Ireland was confident a deal would be reached.

The Giants, as they did last year, are building a huge pool of early draft picks. They have already added Gold Coast's No.2 pick to their existing No.1, as well as No.12 from the Saints.

They are also poised to also gain No.3 from Melbourne in return for the Demons gaining the right to recruit 17-year-old Jesse Hogan, with only fine details to be finalised.

The Saints are chasing West Coast key backman Mitch Brown and Suns ruckman Tom Hickey. AAP