Per the Miami Herald:
The Miami Heat’s depth continues to be tested.
Already without three rotation players, the Heat lost a fourth rotation player early in Monday’s 119-113 Christmas win over the Philadelphia 76ers at Kaseya Center when Caleb Martin sprained his right ankle in the first quarter of the victory.
With Jimmy Butler (strained left calf), Haywood Highsmith (non-COVID illness) and Josh Richardson (low back discomfort) already out, Martin played the first 8:43 of the game before exiting late in the first quarter and heading back to the Heat’s locker room. He was then ruled out for the rest of the night.