San Francisco Giants first baseman Aubrey Huff's MRI revealed patella tendinitis in his right knee, the club announced Saturday. Huff, who reported pain in the knee Thursday while playing in a rehab assignment game for Class AAA Fresno, will be re-evaluated in San Francisco on Monday. The Giants were preparing to activate him from the disabled list Monday. Huff sprained the knee while trying to scale the dugout railing to join the Giants' on-field celebration following right-hander Matt Cain's perfect game on June 13. Huff played in nine rehab games: four with Fresno and five with Class A San Jose. He went 6-for-29 with a home run and four RBI.