Mitchell becomes the second Jazz player to test positive for contracting the virus, along with Rudy Gobert, sources told Wojnarowski. Gobert's diagnosis led to the postponement of Wednesday's game against the Oklahoma City Thunder.
The Jazz announced Thursday that a second player has tested positive but did not identify Mitchell.
"We are working closely with the CDC, Oklahoma and Utah state officials, and the NBA to monitor their health and determine the best path moving forward," the Jazz said in a statement.
Jazz players are privately saying that Gobert showed a cavalier attitude toward the virus in the locker room, touching teammates and their belongings.
At Monday's media availability, Gobert was seen touching all the microphones and tape recorders at the end of his session with reporters.
Mitchell addressed the situation in an Instagram post, thanking everyone who reached out after his positive test.
"We are all learning more about the seriousness of this situation and hopefully people can continue to educate themselves and realize that they need to behave responsibly both for their own health and for the well being of those around them," Mitchell wrote, without specifically mentioning the coronavirus.
View this post on Instagram
Thanks to everyone who has been reaching out since hearing the news about my positive test. We are all learning more about the seriousness of this situation and hopefully people can continue to educate themselves and realize that they need to behave responsibly both for their own health and for the well being of those around them. I appreciate the authorities in Oklahoma who were helpful with the testing process and everyone from the @utahjazz who have been so supportive. I am going to keep following the advice of our medical staff and hope that we can all come together and be there for each other and our neighbors who need our help❤️🕷
Players the Jazz have faced within the past 10 days are being told to self-isolate, a source told ESPN's Brian Windhorst. In those 10 days, Utah has played the Cleveland Cavaliers, New York Knicks, Boston Celtics, Detroit Pistons and Toronto Raptors.
A Thunder spokesperson told ESPN's Royce Young on Thursday that players and staff who were potentially exposed will be administered COVID-19 tests.
The Raptors announced Thursday that members of the team's traveling party have been tested for the coronavirus and that they are awaiting the results. The Celtics and Pistons both released statements saying players and staff will self-isolate for the time being.
Mitchell's father, Donovan Mitchell Sr., is the New York Mets' director of player relations and community engagement. The Mets said in a statement Thursday that the elder Mitchell had been asked not to report to the team facility and that he will undergo coronavirus testing.
The NBA announced Wednesday night that it was suspending the season following the Jazz's announcement of a positive coronavirus test.
"The NBA will use this hiatus to determine next steps for moving forward in regard to the coronavirus pandemic," the league said in a statement.
For most people, the coronavirus causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia.
The vast majority of people recover from the virus. According to the World Health Organization, which labeled the coronavirus a pandemic on Wednesday, people with mild illness recover in about two weeks, while those with more severe illness may take three to six weeks to recover.
The NBA is expected to address next steps with teams when it conducts a call with the board of governors Thursday. The originally scheduled 12:30 p.m. ET call has been moved back to 3:30 p.m. ET, sources told ESPN's Adrian Wojnarowski.
There are 259 games, roughly 21% of the schedule, left to play this season.
Information from The Associated Press was used in this report.