Giannis Antetokounmpo (lower back) leaves early versus Heat.

Giannis Antetokounmpo was declared out of the Bucks' 130-117 Game 1 defeat to the Miami Heat on Sunday due to a lower back injury, according to the team.

Following the first-round game, Bucks head coach Mike Budenholzer said Antetokounmpo's X-ray was "clear."

"We'll see how he wakes up on Monday," Budenholzer explained.

With 1:40 left in the first quarter, Kevin Love committed a charging violation on Giannis Antetokounmpo, leading Antetokounmpo to fall to the floor and land on his back.

Antetokounmpo exited the court for the locker room after earning his second foul in the first quarter.

However, Antetokounmpo did not try a shot after that and appeared to be hobbling when attempting to sprint up the floor in transition.

Antetokounmpo checked out of the game and returned to the locker room at 8:33 of the second quarter, after Milwaukee committed a delay of game violation.

He was then ruled ineligible for the rest of the game by the Bucks.

"He just wasn't moving [well]," Budenholzer explained. "He didn't seem at ease or confident." It felt like the right thing to do."

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