The NBA did not name the player who had tested positive, but several United States media outlets reported it was French defensive standout Rudy Gobert, who was listed first as questionable for the game and then as out with illness.
But the Raptors played the Utah Jazz in Salt Lake City on Monday night, and the "players were in close physical contact", and such, according to a statement from the Raptors, players were tested as well.
More than 1,200 people have tested positive for coronavirus in the USA and 38 people have died from the respiratory disease.
Players from teams the Jazz have faced within the past 10 days are being told to self-quarantine, a source told ESPN's Brian Windhorst.
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Utah Jazz centre Rudy Gobert touches media microphones and recorders at a press conference. He feels strong and stable, even well enough to play tonight before the game was postponed.
The Jazz said in a statement Thursday morning that Oklahoma health officials tested every member of the team's traveling party, with one additional positive outcome.
The Jazz is home to Australia's Joe Ingles and Dante Exum - both of whom also play for the Boomers.
Media are reporting the Jazz and Thunder players have been quarantined in the OKC arena.
The suspension of National Basketball Association league play comes the same day that the World Health Organization officially characterized the spread of the coronavirus as a worldwide pandemic. About 30 minutes later, fans were informed that the game was postponed "due to unforeseen circumstances". That player's symptoms diminished as the day went along, but the decision was made to test for COVID-19 anyway. "When professional teams use college facilities, access to the gym is restricted; furthermore, the practice occurred when much of our student body was away from campus", the college said.