A league source claims that the agent of Brian Urlacher has asked the Bears to trade his linebacker client, according to the Chicago Sun-Times. Yet another source believes that Urlacher is threatening to retire from the game of football because of neck and back problems. "Urlacher has no leverage," the source said. "He wants to be paid, right? If he takes a medical [retirement], then he's got to prove he's hurt. If he does that, he'll never get paid. They're not going to trade him. All he can do is be disruptive." "It's a joke. Players never walk away from millions. They threaten to, but they never do it," the league source added.