Reaves, who returned to action on Tuesday after missing three games with a mild left calf strain, suffered a similar injury during the first half of Thursday’s loss to the Rockets. Unfortunately, he has been diagnosed with a Grade 2 strain and will miss at least four weeks. Marcus Smart replaced Reaves in the lineup to begin the third quarter and should remain in that role. While the offensive output can be inconsistent, Smart’s defensive ability is much-needed, as the Lakers are among the worst in the NBA in defensive rating.