Nets guard Kyrie Irving missed Thursday’s game against the 76ers for what the team listed as personal reasons. And shortly before tipoff, Nets coach Steve Nash said he had no clue what those reasons were.

Nash is already without Kevin Durant due to contact tracing quarantine. But the Nets coach didn’t find out he had lost his other All-Star until 30 minutes before his pregame press conference, and Nash had no explanation why less than two hours before tipoff at Barclays Center against the top team in the Eastern Conference.

“I don’t know. I sent him a message. I just found out. So I just sent him a message in the last half hour and haven’t heard back yet,” Nash said. “Obviously thinking about him and hope all is well and, yeah, it’s a private matter.”

According to a report by The Athletic, Irving is fine, but there is no timetable for his return.

The Nets also have lost point guard Tyler Johnson to contact tracing, although Nash did confirm that Durant — who initially was expected to miss four games — could be back after sitting out just three. That means he possibly will return Sunday against the Thunder at Barclays Center.

“I think Kevin’s situation is that if he continues to test negative he can play Sunday,” Nash said. “That’s all I have on that. But hopefully, can’t wait for Sunday to come.”

Still, the Irving situation is both concerning and comes at a poor time.

He played just 20 games in his Nets debut last season after his campaign was cut short by shoulder surgery. Irving also left the Garden last Jan. 26 after learning of Kobe Bryant’s tragic death and didn’t play that night against the Knicks.

This time, Irving not only is enjoying not only a hot start to the season, but also is coming off an impressive outing in leading the Nets to a 130-96 rout of the Jazz on Tuesday.

Nash said, however, this wasn’t just a case of respecting Irving’s privacy, but that he actually had no idea why the point guard wasn’t at Barclays Center.

“I don’t. I haven’t spoke to him yet. I’ve messaged him,” Nash said. “When I found out, I came in here and basically talked to you guys, so I don’t have an update on him.”

Irving came into Thursday sixth in the NBA in scoring (27.1), tied for seventh in 3-pointers (26), and fourth in plus-minus (+94), trailing only Tobias Harris, Joel Embiid and Giannis Antetokounmpo.

The loss of Irving — even if it is temporary — compounds the Nets’ backcourt woes. They already are without not only Durant but also Johnson and starting guard Spencer Dinwiddie (right ACL surgery). With Nic Claxton (right knee tendinopathy) and Reggie Perry (left groin soreness) also out, the Nets had just 11 players Thursday.

Johnson, like Durant, has tested negative for COVID-19.

“It is separate from Kevin. Completely isolated from Kevin’s situation,” Nash said of Johnson. “And he has not tested positive for COVID, so he’s just in a contact tracing protocol basically, and has been testing negative, and will go through that protocol and hopefully he’ll continue to test negative.”

The 76ers (7-1) provided as stiff an opponent as the Nets possibly could have drawn while shorthanded.

Philadelphia coach Doc Rivers eschewed coachspeak, admitting the Nets were at a severe disadvantage while being robbed of both Durant and Irving. The trick was keeping his own 76ers focused against the shorthanded Nets.

“Listen, we’re not going to trick them. We’re not going to tell them ’Hey, you know they’re just the same without these two guys.’ It just doesn’t work,” Rivers said. “We have to take care of our own, you know what I mean? We have to just keep getting better and take advantage of any night that we quote unquote, have a better chance to win and these are one of them without their key guys.”