The Mavericks have reached an agreement with free-agent center Brendan Haywood, who will receive as much as $55 million in a six-year contract. Multiple league sources told SI.com on Thursday that the last year of the deal is not guaranteed.

Dallas acquired Haywood in February as part of a seven-player trade with Washington. The 30-year-old Haywood averaged 8.1 points, 7.4 rebounds and 2.0 blocks in 28 games with the Mavericks, splitting the starting role with Erick Dampier. Dallas is looking to trade Dampier, who has a non-guaranteed $13 million contract for next season.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.