Houston Rockets center Steven Adams will be out indefinitely due to a sprained left ankle, according to head coach Ime Udoka.

"Severely sprained ankle," Udoka said. "I think [it's] a Grade 3 or so, but still gathering information, opinions. But I don't think he'll be back anytime soon."

Adams suffered the injury on Sunday against the Pelicans when landing awkwardly after defending Zion Williamson at the rim. 

The 32-year-old is averaging 5.8 points and 8.6 rebounds in 22.8 minutes this season. The Rockets lead the league in rebounds with 49.2 boards per game.