WR Terrell Owens suffered a serious knee injury that required surgery in the past month and he could be out for six months, according to a report by Chris Mortensen of ESPN.

Owens, who played last season for the Bengals, underwent surgery to repair a torn anterior cruciate ligament in one of his knees following an injury earlier this offseason. Dr. James Andrews performed the surgery. One source told Mortensen that Owens was hurt taping a television show for VH1, while another said the injury occurred during a personal workout.

Neither Owens nor his agent Drew Rosenhaus chose to comment to ESPN on the story. According to the report, Owens' best-case scenario would be a mid-to-late November return to the field.

Owens is tied for second with Randy Moss on the NFL's all-time receiving touchdowns list, trailing only Jerry Rice. He will be a free agent when the lockout ends. In his 15th NFL season, Owens led the Bengals in receptions, yards and touchdowns. He will be 38 in December.