The Jets, who will be without injured running back Curtis Martin will look into acquiring two veteran backs who could end up on the trading block - Chris Brown of the Titans and Thomas Jones of the Bears. Brown already has formally requested a trade, but it was denied by Tennessee management. Jones could be expendable because of Chicago's big investment in former No. 1 pick Cedric Benson. Chances are, the Jets will wait a game or two before doing anything, giving them a chance to evaluate Cedric Houston, Derrick Blaylock and rookie Leon Washington. By then, they also could have a better handle on Martin's condition.