Amar'e Stoudemire underwent a surgical procedure in July to repair one of his ailing knees, according to a team source.
It marked the third surgery in 12 months for the New York Knicks' forward, whose offseason did not include much basketball. The surgery in July was described as a "clean up" and is not considered serious.
The secrecy surrounding Stoudemire's latest health issue could be an indication that the club is not optimistic that they can rely on the veteran power forward.
Stoudemire appeared in just 29 games last season and had debridement surgeries on both of his knees, the right knee in October and the left in March.