Bucks center Andrew Bogut missed Friday night's game against Dallas because of concussion-like symptoms.
The 7-foot Bogut fell backward and hit the back of his head on the floor while taking a charge during Thursday night's victory over Detroit.
Bucks coach Scott Skiles said Bogut failed a pregame test to check for concussion symptoms and was ruled out in accordance with the league's concussion policy.
"There a new rule on concussion protocol, he couldn't pass the test, so he's out," Skiles said, without elaborating.