Bucks officials said Tuesday that he will be out for at least two weeks and would be evaluated again at that point. Antetokounmpo, 28, had an MRI after a leg injury had knocked him out of a 118-112 loss at Chicago a night earlier.
Milwaukee is the No. 3 seed in the Eastern Conference playoffs and opens a first-round series with the Miami Heat on Saturday.
Antetokounmpo, the older brother of teammate and two-time reigning MVP Giannis Antetokounmpo, has played 57 games and made three starts this year. He is averaging 2.9 points, 2.2 rebounds and 9.7 minutes.