The team is still waiting for test results from other players. The Celtics played both the Jazz and Nets recently, and when I found out on Tuesday that the Nets had four positives, I suspected once the Celtics results were in, they would have at least one positive.
Update: The player is Marcus Smart:
Celtics guard Marcus Smart announces he has tested positive for coronavirus.
I was tested 5 days ago and the results came back tonight, which were positive. Ive been self quarantined since the test, thank goodness. COVID-19 must be taken w the highest of seriousness. I know it’s a #1 priority for our nations health experts, & we must get more testing ASAP pic.twitter.com/xkijb9wlKV