Green Bay receiver Javon Walker, who missed last season after undergoing knee surgery, is demanding to be traded and threatening to retire at age 27. He's putting his house on the market and not planning to play the last year of his five-year contract. Walker, who underwent surgery in Houston and has been rehabilitating here, would be an ideal addition for the Texans, who are desperate for a receiver to play opposite Andre Johnson. The Packers insist they aren't going to trade Walker, who fired agent Drew Rosenhaus and replaced him with Kennard McGuire. The problem, of course, is that Walker is coming off major knee surgery. If the Packers end up trading Walker, they'll have to get a conditional pick that escalates based on his performance. His new team wouldn't give him a lot of money until he proved he could return to his form of 2004, when he was terrific.