An MRI on Sunday revealed that Celtics guard Marcus Smart suffered a Grade 1 left calf strain on Saturday night against the Lakers, according to The Athletic's Shams Charania.
It is unclear exactly how much time he will miss, but a Grade 1 calf strain is the least severe.
Smart, a two-time All-Defensive team guard, suffered the calf injury in the fourth quarter of Boston's eventual 96–95 loss to L.A. after making minimal contact with Lakers forward Montrezl Harrell.
Smart was immediately helped to the Celtics' locker room and put no weight on his left leg.