Golden State Warriors All-Star Draymond Green threw a punch at teammate Jordan Poole at practice on Thursday, sources told ESPN.

The two players had been verbally sparring prior to some pushing, which escalated when Green took a swing and made contact with Poole, sources said. Team officials are reviewing the episode, sources said.

Poole wasn’t hurt by the punch and completed his workout before leaving the practice floor on Thursday, sources said.

It is possible there could be some punishment meted out to Green for escalating the practice encounter, sources said.