Way back in September, the Kansas City Chiefs were preparing for their final cuts before the commencement of the 2009 season. A report came out that Zach Thomas, then a member of the Chiefs, would be retiring. That was quickly refuted by Thomas' agent and he returned to practice.
A few days later, however, the Chiefs released him, which led to Thomas reportedly filing an injury grievance with the club.
Basically, teams can't release injured players without an injury settlement. Thomas obviously contended he was injured (likely as a result of concussions) while the Chiefs claimed team doctors cleared him to play.
Thomas recently told Barry Jackson of the Miami Herald that his grievance with the Chiefs is still unresolved and he has concussion symptoms "including fuzziness when it gets cold."
Thomas had a $1 million base salary with the Chiefs.
He also told the Herald he has played his last NFL game and would like to sign a ceremonial contract in Miami because "I'm a Dolphin for life."
For a more detailed explanation of Thomas' grievance, check out this article we did in September.