Milwaukee Bucks head coach Mike Budenholzer said the franchise are awaiting to discover the severity of Giannis Antetokounmpo's injury after the two-time NBA MVP hyperextended his knee in Game 4 of the Eastern Conference Finals.

The Bucks' 110-88 loss to the Atlanta Hawks – who levelled the series at 2-2 despite the absence of Trae Young – was compounded by a knee injury to superstar Antetokounmpo on Tuesday.

Antetokounmpo (14 points) landed awkwardly on his left leg with just over seven minutes remaining in the third quarter in Atlanta, where he jumped up to contest an alley-oop from John Collins to Clint Capela, but his knee buckled before hobbling to the locker room.

The third-seeded Bucks – eyeing their first championship since 1971 – now face an anxious wait regarding the fitness of their best player heading into Thursday's Game 5 in Milwaukee.

"We'll see how he is tomorrow," Budenholzer said. "We'll take everything as it comes. We'll evaluate it. We've got a heck of a team, a heck of a roster."

"We'll take everything as it comes," Budenholzer continued. "We have a heck of a team, a heck of a roster. The guys will be ready to compete and play. That's what it's about. We got a Game 5."

Antetokounmpo has been averaging a career-high 29.2 points in the playoffs, along with 13.0 rebounds and 5.4 assists.

The 'Greek Freak' had averaged 28.1 points, 11.0 rebounds and a career best-tying 5.9 assists per game in the regular season.

Budenholzer added: "Obviously, Giannis is a big part of our soul, our fibre. I'm sure there is the human element, the concern, the care for him is real."

"It's not good," Bucks veteran P.J. Tucker told reporters. "But this is the Eastern Conference Finals. There is no excuse. It doesn't matter whoever is playing, not playing.

"They've got guys hurt. Everybody is hurt. Everybody is banged up. Everybody is injured. You've got to fight through it.

"It's not good losing anybody on your team. You lose your best player, it stinks."

Milwaukee had shot 50 per cent or better from the field in each of their last two games after not reaching that mark in any of their first 12 playoff games this year. The Bucks had won nine straight playoff games going back to 2018 when making at least half of their shots.

However, the Bucks were just 39.3 per cent from the field as Jrue Holiday (19 points) and Khris Middleton (16 points) were the only other players aside from Antetokounmpo to finish in double-digits.

Holiday's nine assists took his tally to 121 this postseason – the third most in franchise history behind Oscar Robertson (149 in 1974 and 124 in 1971) after eclipsing Sam Cassell (120 in 2001).

"They had a lot of guys play well tonight, for really the whole game," Budenholzer said. "Credit to Atlanta. They played well from the start. They played well coming off the [Trae Young] injury.

"We've got to be better on both ends. Our group will gather. The character of our group will come through. We are going home. It's 2-2. We are going back to Milwaukee."