Giannis Antetokounmpo exited the Milwaukee Bucks’ 104–91 win over the Boston Celtics on Tuesday at Fiserv Forum in the third quarter due to a left calf injury.

After the game, Bucks coach Doc Rivers told reporters that Antetokounmpo will get an MRI to determine the severity of the injury. He also was asked about what the team’s concern level is with Antetokounmpo’s calf.

“That’s a good question. High,” Rivers said after the game, via ESPN’s Jamal Collier.

“But he’s Giannis. I think everyone probably feels the same way as I do right now. We’re just going hope for the best.”

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Shortly after inbounding the ball to teammate Damian Lillard during the third quarter, Antetokounmpo pulled his calf. After taking three steps, Antetokounmpo suffered a non-contact injury and collapsed. He hobbled into the Bucks locker room after receiving assistance leaving the court.

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Giannis Antetokounmpo is still undergoing diagnosis

The duration of Antetokounmpo’s absence due to his calf injury is unknown.

73 of the Bucks’ 80 games this season have seen Antetokounmpo on the court, marking the most games he has participated in during the regular season since taking home his first career NBA MVP trophy in 2018–19.

The Bucks, with a 48–31 record that puts them in second place in the Eastern Conference, will play their final two games of the regular season on Wednesday against the Orlando Magic and Friday against the Oklahoma City Thunder.