Donovan Mitchell became the the second N.B.A. player known to have tested positive for the coronavirus. The N.B.A. suspended its season after the first, another Jazz player, Rudy Gobert, tested positive for the virus shortly before tipoff of a game Wednesday night against the Oklahoma City Thunder.

“Thanks to everyone who has been reaching out since hearing the news about my positive test,” Mitchell wrote on Instagram.

Adam Silver, the N.B.A. commissioner, said that the league’s suspension would probably last “at least 30 days.” He made the comment in an interview that aired Thursday on TNT’s “Inside The N.B.A.”

Beyond that, Silver said that it was too early to predict anything and that it was possible that the rest of the season would be canceled.

Earlier in the week, Gobert had made light of concerns about the coronavirus — something that Silver referred to as a “huge mistake” and that Gobert has since apologized for on social media.

“We spoke to him today, in fact, about doing a public service announcement with the league just because we know the public follows what these players do,” Silver said.

Charles Barkley, one of the hosts of “Inside The N.B.A.,” did not appear in the studio, joining instead by phone. He said at the beginning of the show that he was self-quarantining for 48 hours after not feeling well following a flight from New York to Atlanta. He said he had been tested for the coronavirus but had not received the test results.