Sims (knee) is listed as probable for Friday's game against Boston.
Sims has started in the Bucks' last three contests, most recently finishing with six points, 20 rebounds and two assists in Wednesday's loss to the Houston Rockets. While the 27-year-old is expected to suit up versus the Celtics, it's unknown if he'll remain in the starting lineup, considering Kyle Kuzma and Myles Turner are off the injury report.