Frank Ntilikina left his World Cup bronze medal back in France, but the newly emboldened Knicks point guard believes he is bringing his game to the U.S.

And Knicks coach David Fizdale is bringing over a couple of the play the French team ran for the Knicks’ maligned 2017 lottery pick.

Fizdale said he watched 90 percent of France’s games in China — especially the one in which it beat the U.S. The coach for the national team was Vincent Collet, who coached Ntilikina in the French League.

“I think that’s what he needed. He needed to feel that success,” Fizdale said after the Knicks’ second practice of training camp. “I studied the heck out of him. And it’s really what I’ve always said about him. He can be on the ball. He can be off the ball. He can guard multiple guys on the court. I stole a couple of their sets, too. I’m a thief, stealing from the coaches. All the coaches over there were running great stuff and then I just really wanted to lock in on some different things that were successful for them in the game [versus the U.S.].”

Fizdale has Ntilikina in the mix in the competition for starting point guard with Dennis Smith Jr. and newly signed Elfrid Payton.

The Knicks have a big decision to make by Oct. 31 whether to exercise the fourth-year option on Ntilikina’s rookie contract ($6.2 million) or let him become an unrestricted free agent next summer.

Knicks GM Scott Perry indicated he’d wait for the deadline before making the call as the Frenchman has struggled offensively in his first two seasons, averaging a career 5.9 points on 35.4 percent shooting. He was on the trading block on draft night.

“I learned a lot,” Ntilikina said of competing in the World Cup. “How good I can be playing basketball. It’s simple on both sides of the court. A competition like that brought me a lot of confidence.”

Ntilikina played 43 games last season, hampered during the season’s second half by a groin strain. The organization became concerned about his durability. The 21-year-old from Strasbourg said sitting out allowed him to “see the game differently,” enabling him to be more aggressive for the French squad.

“It’s been tough but it’s all part of the process,” Ntilikina said of his first two years. “I just keep on trusting it. If it happened, that means it was meant to happen. I just keep being strong mentally and keep trusting mentally and keep trusting my abilities.”

Ntilikina shot just 28.7 percent from 3-point range last season. In China, he increased that to 33.3 percent and nailed two jump shots late to beat Team USA and outplay star point guard Kemba Walker.

Before the World Cup, Fizdale said he made a point to visit Ntilikina in Los Angeles and in Dallas during the spring to lift his dampened spirits.

“I think he’s coming in with a whole fresh mindset,” Fizdale said. “His health was really the thing that was demoralizing. He’s healthy this year.”

The contract option is not on Ntilikina’s mind, he said. He missed all the team’s informal pickup games in September because of the World Cup and arrived only days before camp opened.

“I think right now it’s not the main thing I have to think about,” Ntilikina said. “Right now it’s training camp, how to form a good group with my teammates, how to play good basketball and stay healthy.

“Did a lot of things with the staff here this summer. As a young player, you try to learn how your body responds to 82 games with that kind of intensity. Right now I’m working differently on my body to stay healthy.”

Knicks president Steve Mills said Ntilikina’s been tough to evaluate because of injuries.

“We were all very excited Frank had a chance to be healthy and what that meant to his ability to perform this summer,” Mills said. “That was a good sign.”

What it means in his battle versus Smith and Payton remains to be seen.

“It’s great,” the 6-foot-6 Frenchman said. “We like it. It’s a healthy competition. It’s just good for New York because we have three very talented players. We’re going to make each other rise, give each other advice. We’re not going to be easy on each other.”

While France celebrated the bronze and beating the Americans, Ntilikina thought the club could have achieved more.

“To be really honest with you, we wanted to go all the way,” Ntilikina said of the French team, which lost to Argentina in the semifinals. “Especially after beating Team USA.”