"The way they described it to me is we'll see how the next few days go and kind of evaluate him and see where he is then," Bucks coach Mike Budenholzer said.
Antetokounmpo suffered the injury in Friday night's game against the Los Angeles Lakers and underwent an MRI, which revealed the injury.
"Overall we're very pleased," Budenholzer said. "I think this is about as good an outcome and prognosis as we could hope for, I guess, unless it was nothing."
Antetokounmpo, the NBA's reigning MVP, is third in the NBA with a 29.6 points-per-game average.