LAS VEGAS — Minutes after Morez Johnson Jr. made his NBA Summer League debut Thursday, a current teammate and a former teammate took separate turns crashing his postgame news conference.

First, Dallas Mavericks forward Cooper Flagg butted in to congratulate Johnson on his near double-double.

Then Yaxel Lendeborg — the Golden State Warriors rookie who won a national championship alongside Johnson at Michigan in the spring — interrupted to ask Johnson about getting to face each other.

“I tried to big boy him,” Lendeborg said after the Warriors’ 101-90 win over the Mavericks. “Never worked.”

If Thursday’s game was any indication of how his first NBA season will go, Johnson is going to be a formidable presence inside. The 20-year-old, who grew up near Chicago, scored 27 points, collected eight rebounds and notched three steals and two blocks. His two-way impact allowed the Mavericks to at least make the game competitive — cutting Golden State’s lead down to 3 with four minutes remaining — after they fell behind by 24 points.

“He’s relentless,” Lendeborg said about Johnson. “It seems like he never gets tired. He’s just a strong human being. It’s just ridiculous. He’s going to be a monster in a few years. Maybe this year, too.”

Lendeborg has a chance to make an immediate impact in the NBA, too. The 6-foot-9, 241-pound Lendeborg is uncommonly skilled for someone who’s built like an NFL tight end. Lendeborg had 21 points, 10 rebounds and six assists.

Multiple times in Thursday’s game, Lendeborg drove the ball directly at Johnson in the paint.

“I was expecting him to come at me, of course,” Johnson said. “We compete all the time. Compete in practice. Compete off the court. We have little challenges and stuff like that. I was expecting that.”

Johnson and Lendeborg combined for 79 games started for Michigan last season. The Wolverines were one of the most dominant college basketball teams in recent memory, posting a 37-3 record and winning their six NCAA Tournament games by an average of 19 points.

Dusty May, who was Michigan’s coach, chose to leave the school and join the Mavericks. On the same day Dallas announced him as its head coach, the Mavericks chose Johnson with the No. 9 pick, the Warriors selected Lendeborg at No. 11 and the Oklahoma City Thunder snapped up Aday Mara — Michigan’s 7-foot-3 center — at No. 12.

Lendeborg predicted Thursday that May won’t have any issues acclimating to the NBA.

“He’s a player’s coach,” Lendeborg said. “He’s a guy you can look up to not just as a coach but as a father figure. He cares about you more as a person than just basketball. That definitely goes a long way.”

While May will have to compete against Lendeborg and Mara several times every season in the Western Conference, he’ll at least be able to lean on Johnson, whose nonstop motor is already earning him praise among teammates.

“I love him already,” Mavericks point guard Ryan Nembhard said. “He plays so hard on both ends. He’s going to impact a game some way, somehow. Whether it’s shots falling or not. Rebounds. Blocked shots. Switches 1 through 5. Loved watching him at Michigan. It’s been great getting to play with him today. Looking forward to continuing to see what he can do.”