Chandler missed the Knicks' 120-99 victory over Washington on Tuesday because of a bulging disk. The All-Star centre had played in the previous four games after missing 10 in a row, then told coach Mike Woodson he felt soreness after a victory at Oklahoma City on Sunday.
Martin returned Tuesday from a two-game absence with a sore left knee, then went down with a severely sprained left ankle.
The Knicks are also listing backup centre Marcus Camby, who has missed most of the season with foot problems, as doubtful. They are already without big men Rasheed Wallace, Amare Stoudemire and Kurt Thomas.