Dallas Mavericks rookie Cooper Flagg is doubtful for the team's Thursday night matchup against the Utah Jazz, according to the team's injury report.

Flagg, the 2025 No. 1 overall draft pick, left Wednesday night loss to the Denver Nuggets with a left ankle sprain.

Head coach Jason Kidd said Flagg initially hurt his left foot during Monday's victory over the Brooklyn Nets then landed awkwardly on it with 6:01 remaining in the second quarter against the Nuggets. Flagg grabbed the ankle for a few moments while grimacing in pain.

Flagg returned later in the second quarter but was clearly struggling with the injury. He did not play in the second half and did not return to the bench.

"He stepped on someone's foot and so I think last game he twisted his ankle, too," Kidd told reporters after the game. "So they decided to hold him for the second half."

Flagg has avoided injury for the most part this season having played in 40 of the Mavericks' 41 games. The Rookie of the Year frontrunner is averaging 18.8 points, 6.3 rebounds, 4.2 assists, and 1.3 steals per game.

The Mavericks will play the Jazz again in Dallas again on Saturday evening before leaving for a one-game road trip to face the New York Knicks on Monday.