As fellow Europeans who were in the same draft class and had faced each other since they were 15, Mario Hezonja grew close to Kristaps Porzingis.

“It’s a little disappointing I never got to play with him,’’ Hezonja said before the Knicks’ 113-99 loss to the Celtics.

In fact, the only current Knicks who played with Porzingis are Enes Kanter, Frank Ntilikina, Lance Thomas and Damyean Dotson.

Hezonja was picked fifth in the 2016 draft by Orlando right after Porzingis, who will join fellow European, Luka Doncic, the front-runner for NBA Rookie of the Year.

Hezonja said Dallas has three of the top Europeans to ever play the game — including 40-year-old Dirk Nowitzki.

“They can be really, really serious,’’ Hezonja said of the Mavericks. “They can be pretty deadly out there. That’s a serious team, if all of them stay healthy I hope.”

Hezonja, who spoke to Porzingis in both English and Spanish, didn’t sense his compadre wanted out — as the Knicks have claimed.

“Not at all but that’s just how the NBA works right now,’’ Hezonja said. “I support KP, that’s my friend. But I also support Scott [Perry] and Steve [Mills]. [Orlando] wanted me on draft night and Scott P drafted me, so that’s my people and I support their decision and I know they know what they’re doing and I know this is going in the right direction and I know ultimately we’ll win.’’

Nowitzki said he believes the Mavericks pulled off a heist Thursday and is hoping Porzingis has as almost as long a career in Dallasas he has enjoyed. Porzingis, 23, considers Nowitzki his inspiration and boyhood idol.

“He’s got a franchise-type player game,” Nowitzki said in the Dallas Morning News. “He’s a perfect fit for the new NBA. He’s mobile enough to play the four [power forward], he can be a spread-five [center], he can roll, block shots, post. … Before he got hurt, he played a great all-around game — and he’s got the work ethic to be great.”

The three new Knicks — DeAndre Jordan, Wesley Matthews and Dennis Smith Jr. — were at the Garden for the game against the Celtics Friday, but couldn’t dress until physicals are all completed. The depleted Knicks, missing Emmanuel Mudiay (shoulder) and Ntilikina (groin), started two-way G-Leaguer Kadeem Allen (nine points, five assists) and Dotson (22 points, six rebounds) in the backcourt. … Center Luke Kornet returned ahead of schedule from his ankle sprain after missing 11 days. He started, logged 18 minutes and scored nine points.