James Harden is now questionable for the Brooklyn Nets‘ Tuesday night Game 5 against the Milwaukee Bucks.

Harden is expected to test his injured hamstring in shootaround and has been determined to try and find a way to get cleared to play in Game 5, sources tell ESPN’s Adrian Wojnarowski. Harden was initially ruled out for the game by the team on Monday, then upgraded to doubtful Tuesday morning before being listed as questionable Tuesday afternoon.

Before Sunday’s Game 4 loss, Nets head coach Steve Nash said Harden was doing on-court work, shooting and rehabilitation.

Harden suffered what the team has called “right hamstring tightness” 43 seconds into Game 1 of the series. His push to return comes after the Bucks have won two straight games to tie up the series 2-2.

Brooklyn’s effort to reach the Eastern Conference finals took another hit in Game 4 when Kyrie Irving exited with a sprained right ankle. He has been ruled out for Game 5.