CHARLOTTE, N.C. — The Nets will be without Cam Johnson for at least the next 10 days with a calf injury.

It’s a tough blow for a team that came into Monday night’s 133-121 win over the Hornets already shorthanded.

“It’s getting better day by day,” Johnson said. “Something kind of random popped up at the very end of the [Cleveland] game, but it’s a little bump in the road. I’ll be back. I’ll be fine.”

Johnson underwent an MRI on his left calf contusion that revealed a strain.

The forward will be reevaluated in 10 days, per team sources.

Including Monday night, the Nets will have six games in that span before he is reexamined.

“I did have hope, but reality set in a little bit,” coach Jacque Vaughn said. “We ended up getting an MRI. So we were waiting on those results on his contusion just to be safe and it revealed a strain. So we’ll reevaluate him in 10 days and see what he looks like from there.”

It’s the latest in a string of injury setbacks for Johnson.

He missed the entire preseason with a hamstring injury to the same leg.

Johnson returned for last Wednesday’s regular-season opener, scoring 12 points on 5-for-10 shooting with five rebounds, three assists and two steals in the narrow loss to the visiting Cavaliers.

But he suffered the injury late in that game and will end up missing at least two weeks.

“It was the very, very end,” Johnson said. “It was the very, very end. So that last play with [Donovan] Mitchell, I kind of took a knee to the calf, and then somewhere in the next 10 seconds or so, something else must have happened. So it’s just kind of one of those things that you just can’t really control — random.

“These things happen. And coming along this far, it’s happened before, and I’ve been able to pull it together somehow, someway, and that’s what I’ll do this time and continue to do that rest of the season and get back on track and get healthy and ride that wave.”

Johnson arrived from the Suns alongside Mikal Bridges in last season’s Kevin Durant trade.

He then inked a four-year, $94 million extension in the summer.

His floor spacing will be missed for the Nets, with his 42 percent accuracy from 3-point range over the past two seasons fifth-best among players with at least 500 attempts.

In Johnson’s absence, the Nets handed high-scoring youngster Cam Thomas back-to-back starts in a three-guard lineup.

The 27-year-old Johnson said it wasn’t a case of any setback following the initial injury, but the MRI simply revealing an added reason to be cautious.

“Yeah, it’s actually gotten better every day,” Johnson said. “It’s gotten a lot better every day, and it feels a lot better than it did Friday shootaround before Dallas.

“So I think the MRI just is more of a yellow light, just to make sure that that’s all cleaned up. If it was just the contusion that was there before, then you’re not really at too much risk going back out there and playing. But what the MRI showed is just take it a little bit slower, and I’ll be fine.”

Johnson, who tore his left meniscus in 2017, was adamant that the injury not only had nothing to do with his training camp hamstring injury but was not a result of the wear and tear of a long summer playing for Team USA in the FIBA World Cup.

“No, I don’t think so,” Johnson said. “I don’t think so. And I feel good overall, those two instances aside, I feel healthy. I don’t feel worn down at all. So I’m looking forward to getting back out playing and having a good stretch.”

Center Nic Claxton (left ankle) sat out in Charlotte and will also miss Wednesday’s game in Miami.

Spencer Dinwiddie suffered a sprained left ankle in the first half Monday.

He tried to warm up at halftime but couldn’t return.

The Nets slipped out of the Top 10 in valuations of NBA teams for the first time in years, according to Forbes.

While the Nets did see their value rise 10 percent, other teams outpaced them.

The Nets outrebounded their foe in each of their first three games of the season (by at least seven boards in each game) with a total rebound advantage of plus-26.

Cam Thomas (33 points) has cracked 30 in the first three games of the season.

He’s the second-youngest player in NBA history to score 30 in all of his team’s first three games of a season, behind only Shaquille O’Neal (who was 21 years, 248 days).

His 99 points are tied for second-most in Nets history through three games, behind only Kyrie Irving’s 113.