Relentless. Diligent. The first to arrive at practice and the last to leave, working as hard as anybody the whole time he’s there.

That’s what the Nets say about Caris LeVert. And that’s how they say the 6-foot-7 rookie combo guard came back from a Jones fracture in his foot last December — and surgery in March — to finally be cleared to make his NBA debut. He was in uniform, but did not see action in Monday night’s 118-113 loss to the Wizards at Barclays Center.

“It’s been tough. The performance staff has been on me ever since I got drafted really, working a lot of hours before and after everyone is here. I’m glad it finally paid off,” LeVert said before the game.

His work ethic has left his teammates inspired.

“I call him the hardest-working man I ever met,” gushed fellow rookie Isaiah Whitehead. “Just to be here every day so late and so early, really put the time in to get back. He had a real tough injury. We’re always supporting him, but it’s him. He 100 percent put in the full effort to get where he is now.”

That tough injury was a fracture suffered last Dec. 30 — his third foot fracture in a 22-month span — that cut short a stellar senior campaign at Michigan.

LeVert even tried to come back that season, with an 11-minute cameo in February before getting shut down and having a reconstruction done by Dr. Martin O’Malley, the Nets’ foot specialist. Brooklyn traded Thaddeus Young on draft night to land LeVert, the No. 20 overall pick. As confident as they were in his health, they were even more confident in his heart.

“I know all the hard work I put in, so it’s not hard to believe [I’m back]. The time went by kind of fast. I can’t believe it’s been that long, but I’m really anxious to get out there,’’ said LeVert, who has been arriving at HSS Training Center at 8 a.m. — well before his teammates — and not leaving until 3 p.m., when they’re long gone.

“It’s not an easy thing,” coach Kenny Atkinson said. “Especially in the beginning he was set apart, working his rehab, then off-court stuff, then on-court stuff. That can get boring, repetitive. His diligence, his work ethic, his character, all the stuff we believed in when we drafted him has shown. Now that he’s starting to get with the group and we’re seeing him in game-like situations, I believe he’s a system fit.

“He can shoot the 3, he’s versatile, he moves well, so just looking forward to having him with us and getting him involved. … He’s a young guy. To stick with it and not have mood swings, to come in with a smile on your face [is rare]. My concern was is he doing too much?… It’s always refreshing to see a guy in that situation has put in the work in a positive spirit. It’s really good for our program.”

LeVert was still on crutches in May, just getting on a treadmill in July and didn’t practiced until Nov. 21.

“I love playing, I love competing, so [missing games] was probably the toughest part,’’ LeVert said.

“I don’t know what I’d do if I didn’t play basketball for a year-and-a-half,” Sean Kilpatrick said. “I’m happy for him I’m proud of him on how far he’s come, and I think he’ll do pretty well.”

Nets general manager Sean Marks expects so, with sources saying the team had LeVert at No. 11 on its internal draft board.

“It’s going to be terrific for him to have an opportunity to be healthy and back with the team,’’ Marks said. “It’s not just for today: We’re looking for a long-term approach, getting him back with our group in an NBA game will be terrific. He deserves it.

“We got a fine young man, and I’m excited, like everybody here, the fan base, the coaching staff, I know his mom is. There’s a group of people wishing him all the best, and we’re right there with them.”