The Nets listed Irving as out for their game Tuesday against Denver, which will be the fourth straight he misses for personal reasons. Nash has said it's a private matter and has refused to discuss Irving's absence in detail.
He did say that he believed Irving was tested for the coronavirus on Sunday, though he wasn't sure about Monday. Whether Irving has continued to be tested during his time away could determine how quickly he would be eligible to play upon his return.
The Nets have lost two of their three games without Irving. Kevin Durant missed two of them because of the NBA's health and safety protocols for COVID-19 before returning Sunday in a 129-116 loss to Oklahoma City.
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