Coming off knee surgery in late July, Bynum originally was supposed to participate to some degree in training camp, which starts Saturday. But Wednesday, the team announced the 7-footer will not be ready for the beginning of camp.
"We don't expect he's going to play in the preseason, but we're hopeful he'll be ready for the start of the regular season and hopeful he could play in one or more of the final preseason games," Lakers spokesman John Black said.
"Once camp starts [on Sept. 25], he'll be with us on a daily basis and we'll have more updates."
Bynum suffered a cartilage tear in his right knee in the first round of the playoffs and was limited as the Lakers marched to their second-straight championship. He had the knee drained three times during the playoffs.
The Lakers say he will be evaluated day to day and could resume basketball activities by the end of training camp.
Bynum fully expects to play opening night against Houston on Oct. 26, according to a source close to the player.
Bynum's injury history is piling up. He partially dislocated his kneecap during the 2007-08 season and was limited to 35 games. He played in only 50 games in 2008-09 due to a torn medial collateral ligament in the right knee.
He played in 65 regular-season games last season and averaged 15.0 points and 8.3 rebounds in 30.4 minutes per contest. But he was on the floor for only 24.3 minutes per game in the playoffs and his totals dropped to 8.6 points and 6.9 rebounds per game.
Bynum, 23, is entering his sixth season in the league after coming to the Lakers in the first round of the 2005 draft out of St. Joseph's High School in Metuchen, N.J.
Information from ESPNLosAngeles.com's Dave McMenamin and The Associated Press contributed to this report.