DALLAS — The Nets’ backcourt problems could hit DEFCON Level 2 on Thursday with Garrett Temple questionable with a sore knee.

“[Temple] did not practice. He’s got a sore knee, so monitoring that. He’s questionable for [Thursday],” coach Kenny Atkinson said.

“It’s all right,” Temple said of his knee. But that remains to be seen. With the Nets and their injury history, one can never be too sure.

Caris LeVert hasn’t played since Nov. 10 while Kyrie Irving hasn’t played, practiced or spoken to the press since Nov. 14. David Nwaba had season-ending Achilles surgery, and the Nets are desperately short on guards.

The Nets have used the same starters for 21 straight games, with that five-man unit logging more minutes than any other in the NBA over that span.

But that appears to be taking its toll. Temple — tasked with not only starting, but guarding the top perimeter threat and running the point for the second unit — sat out Wednesday’s practice in Dallas.

LeVert is nearing a return, which would take some responsibility off Temple’s plate.

“That’ll really help,” Atkinson said. “I think it’ll really help [Temple], too, just getting him back in his comfort zone.”

Still, there remains the little matter of getting through Thursday, when they should have Spencer Dinwiddie in bubble wrap.

If Temple can’t play, it would seem Theo Pinson would be needed on the second unit at point guard. That would leave Timothé Luwawu-Cabarrot and Dzanan Musa as off-guards.

Kristaps Porzingis is questionable for the Mavericks. The former Knicks star missed Tuesday’s game against the Thunder with knee soreness. Maxi Kleber could be in line for more minutes against the Nets if Porzingis is out again.

“I [was watching on League Pass] one night and he was hitting 40-footers. He’s so capable,” Atkinson said. “Like every player in this league, he’s coming back from an injury. I’m sure the best Kristaps Porzingis will be next season. That being said, he’s a heck of a player.

“When you’re scouting a 7-3 guy, contests aren’t enough. You have to have great contests against him the way he shoots it. He’s a big-time player.”

The Nets released a statement on the death of David Stern:

“The Brooklyn Nets organization mourns the passing of our dear friend, mentor and former leader, NBA Commissioner Emeritus David Stern. More people today love the game of basketball than ever before and that is in large part to David’s vision. He grew the game beyond our borders, reaching across the globe, and ultimately developed hundreds of millions of fans. We are profoundly grateful for David’s dedication to the league and our organization.

“We extend our deepest condolences to David’s wife, Dianne, sons Andrew and Eric, and the entire Stern family. David will always be our inspiration, our changemaker and, most importantly, our champion.”