Masai Ujiri, the president of the Toronto Raptors, may be charged with assault after an altercation with a California sheriff’s deputy late Thursday, shortly after his team won Game 6 of the N.B.A. finals, the authorities said on Friday.

The Alameda County Sheriff’s Office said that it would pursue misdemeanor assault charges against Mr. Ujiri, one of the N.B.A.’s most celebrated front-office executives .

The incident is said to have occurred at Oracle Arena in Oakland, Calif., moments after the Raptors defeated the Golden State Warriors to give Canada its first N.B.A. championship.

Mr. Ujiri made his way to the court to join the celebrating team, but an Alameda County sheriff’s deputy stopped him because he did not have the proper credentials , said Sgt. Ray Kelly, a spokesman for the sheriff’s office.