Milwaukee Bucks superstar Giannis Antetokounmpo has been ruled out of Game 5 of the Eastern Conference Finals due to a hyperextended left knee.

The third-seeded Bucks announced Antetokounmpo's absence hours before Thursday's tip-off at Fiserv Forum in Milwaukee, where the series is deadlocked at 2-2 against the Atlanta Hawks.

Antetokounmpo hurt his knee in the 110-88 Game 4 loss away to the Hawks in the NBA playoffs on Tuesday.

Two-time MVP 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 Lou Williams to Clint Capela, but his knee buckled before he hobbled to the locker room.

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.

Since 2000, the Bucks are 1-8 in Game 5 when a series is tied 2-2. Their lone win over that time came against Atlanta in 2010, but the Hawks came back to win the series in seven.

The Bucks are 9-0 this postseason when Khris Middleton shoots at least 40 percent from the floor, compared to 1-5 when he does not. In this series, Middleton is eight-for-19 (42.1 per cent) on three-pointers in Milwaukee's two wins, compared to 0-for-16 in the two losses.