The team declared that Hart will be re-evaluated after the All-Star break.
Hart was dealing with knee soreness for several weeks and missed practice time and games. He didn't play in the Lakers' 143-120 loss Sunday against the Philadelphia 76ers and missed last Tuesday's 136-94 defeat versus the Indiana Pacers.
Hart missed both games because of patella tendinitis.
The Lakers are 28-28 and 10th in the Western Conference. They trail the Los Angeles Clippers by 2 1/2 games for the No. 8 seed.
Los Angeles plays the Atlanta Hawks (18-38) on Tuesday night.