Rasheed Wallace's injury may force Knicks to sign Kenyon Martin or Lou Admundson

Rasheed Wallace has missed 21 Knicks games with a stress fracture in his foot. (Jonathan Daniel/Getty Images)

Rasheed Wallace's struggle to return from a stress fracture in his left foot has caused the Knicks to consider signing free agent Kenyon Martin or Lou Admundson, according to sources in a Hoopsworld.com report.

Wallace has missed 21 games after being one of the Knicks' surprise stories in his comeback from a two-year retirement. The 38-year-old was averaging 7.2 points and 3.2 rebounds in almost 15 minutes per game to give the team a front-court presence.

Coach Mike Woodson recently contradicted reports that Wallace's season was over by telling reporters he would return to play after the All-Star break.

Martin, who has played with Knicks Carmelo Anthony, J.R. Smith, Marcus Camby and Jason Kidd, is an unrestricted free agent who last played with the Clippers in 2011-12.

before being waived