The Portland Trail Blazers are working on signing Marcus Camby to a contract extension, according to sources with knowledge of the talks.

Sources said Monday that the two sides had already been negotiating toward a new deal that would keep Camby off the free-agent market this summer.

One source said a deal, if completed, would likely span two years in excess of $20 million.

Portland acquired Camby before the trading deadline from the Los Angeles Clippers after losing centers Greg Oden and Joel Przybilla to season-ending knee injuries.

Although the Blazers remain hopeful that Oden can still have a productive career after missing the bulk of two of his first three NBA seasons, they have been pleased with Camby's immediate impact.

According to sources, they're determined to lock him up before has the chance to become a free agent July 1.