Orlando Magic reserve center Adonal Foyle's sore right knee has bothered him for a while now, which led to his decision to undergo arthroscopic knee surgery this morning, according to sources cited in Josh Robbins' and Brian Schmitz's collaborative report for The Orlando Sentinel:

There's no timetable for Foyle's return, but it will depend on how the knee responds to treatment, the source said.

Magic Coach Stan Van Gundy said it's unlikely that the team will sign another player to take Foyle's spot on the roster.

As Robbins and Schmitz explain, Foyle wasn't expected to play much, if at all, this season. Recovery from knee surgery will keep him off the court, but not out of the locker room, which is where the Magic need Foyle's quiet leadership the most.

UPDATE: here's the official word from the Magic:

Orlando, FL – Orlando Magic center Adonal Foyle has undergone arthroscopic surgery on his right knee, General Manager Otis Smith announced today. His return to action will depend on how he responds to treatment.

Foyle has not played in any of Orlando’s preseason outings. He appeared in 10 games last season with both the Magic and Memphis, averaging 1.7 ppg. and 2.6 rpg. in 6.2 minpg. Foyle was traded to Memphis as part of the three-team deal that sent Rafer Alston to Orlando on Feb. 19, later waived by Memphis on Mar. 1, then re-signed by Orlando on Mar. 23