According to the Washington Post, Gilbert Arenas will miss all of training camp and the first month of the upcoming NBA season. 

Gilbert Arenas confirmed Wednesday that he underwent a surgical procedure this morning that "cleaned out some debris" in his left knee and won't be ready to play for the Wizards until early December. Arenas, who has undergone two surgeries to repair the left knee in the last two seasons, has been limited during the rehab process