After watching Jarrett Allen go toe-to-toe — and elbow-to-elbow — with veteran DeAndre Jordan at the start of camp, Kenny Atkinson said the 21-year-old will benefit from the experience.

And on Tuesday, it’s probably no coincidence that Atkinson pointed to Allen as the standout of practice.

“Jarrett Allen was really good,” Atkinson said. “He played really good — outstanding practice. Let’s leave it at that. If one guy was the standout, he can be it.”

The Nets signed Jordan not just to deal with the bulky centers Allen struggles with, but to teach their young center how to handle them.

“It’s going great. Jarrett’s a great young player. He’s proven to be a great rim protector and he’s getting better each year,” Jordan said. “We’re definitely challenging him every day in practice. For us, being able to battle against each other every day is going to be good not only for us individually but great for our team.”

That higher level of competition stretches across the roster. With Atkinson’s preference to play 10, that means Rodions Kurucs and Dzanan Musa are going to have to fight for their minutes.

“They have to earn it. They have to earn their spot in the rotation,” Atkinson said. “They’ll have to earn their minutes.”

For Musa, that’s meant improving his shooting and heretofore-leaky defense, with Atkinson “really pleased with his progress” in both areas. He still hasn’t pinned down Musa’s position, other than to say it’s not point guard.

“He’s a 2, 3, possible small-ball 4. Because he’s 6-8½, he’s a big dude and he’s getting stronger,” said Atkinson. “So positionally, I could see him playing all spots.”

In Kurucs’ case, the Nets are encouraging him not to hesitate on his shot. Humorously though, when Kurucs mentioned emulating Draymond Green and doing more ball-handling, Atkinson pumped the breaks on that.

“Tell him the coach wants him to be less ball-handler. … Me and him have to get on the same page,” Atkinson said with a laugh. “Someone’s talking to him, on the internet, chat room, whatever. … We have to get back to Rodi on that.

“That was for summer league, maybe he was handling it a little more. Now he’s got to come back to who we are, and put him in his role.”

Nets second-round pick Jaylen Hands is headed to G-League Long Island, sources told The Post.

The ex-UCLA guard — picked No. 56 overall — will presumably sign under the Draft Rights Player rule, which lets teams draft players then ink them directly to G-League deals. He’ll get paid by the G-League, not Brooklyn; so he wouldn’t count against the roster or the cap.