Giannis Antetokounmpo failed to practice on Tuesday and was listed as doubtful for Game 2 of the Milwaukee Bucks' first round playoffs series against the Miami Heat.

MVP candidate Antetokounmpo suffered a lower back contusion in Sunday's 130-117 Game 1 defeat after falling on the floor awkwardly as Miami's Kevin Love slid in front of him to take a charge in the first quarter.

Antetokounmpo initially tried to play on but was ruled out at half-time, however a subsequent X-ray and MRI scan came back clean.

Bucks head coach Mike Budenholzer said on Monday he was "mostly optimistic" about Antetokounmpo's availability with Milwaukee desperate to square the ledger on their home court.

"There's an optimism," Budenholzer told reporters on Tuesday. "Time is a little bit on our side, but that equation will flip. But yeah, I would say we're optimistic."

It had been anticipated the two-time MVP would require a period of rest in the lead-up to Wednesday's game at Fiserv Forum. Antetokounmpo may still get some practice in given Game 2 is a 9pm local time tipoff.

The Greek forward averaged 31.1 points and 11.8 rebounds per game during the regular season, sitting in the NBA's top five for both categories.