Nets forward Wilson Chandler never even suited up for his new team before being suspended for 25 games by the NBA for using performance-enhancing drugs.

The league announced the suspension — without pay — was for testing positive for Ipamorelin. Chandler’s suspension will start with the next regular-season game for which he’s eligible and physically able to play.

The Nets can’t sign a replacement for the first five games of the ban, and will be without Chandler until mid-December.

“During my injury rehab process, before I signed with the Nets, I was prescribed a treatment that included small doses of a substance recently added to the NBA’s prohibited substance list,” Chandler, 32, said in a statement to ESPN.

“I did not realize this substance was banned, and neither did the doctor. I accept responsibility and apologize to my Nets teammates, coaches, front office and fans for this mistake. I will continue to work hard to prepare for the upcoming season.”

Ipamorelin is a growth hormone releasing peptide, according to steroid.com. It helps with improving lean muscle mass, decreasing body fat and — as Chandler mentioned — recovering from injuries. The substance has been on the NBA’s banned list since 2016-17, ESPN reported.

Chandler averaged 6.0 points and 4.2 rebounds in 23.1 minutes over 51 games last season, split between the Clippers and 76ers.

With All-Star power forward Kevin Durant already sidelined for most, if not all, of the upcoming campaign, the Nets signed Chandler last month to a one-year, minimum free-agent deal as combo-forward depth for the likes of Joe Harris, Taurean Prince and Rodions Kurucs.

Brooklyn can move Chandler off its active roster after the fifth game of his ban, so it could open up a spot for a temporary replacement after its Nov. 1 tilt against the Rockets. Once Chandler comes back, the Nets would have to waive or trade a player to make room.

About half the Nets roster spent much of this month in Los Angeles for some Kyrie Irving-led workouts, and several other NBA players joined in as well. Carmelo Anthony — whom Chandler actually was traded for in 2011 — took part in those pickup games, and while a source close to the ex-Knick told The Post there was “nothing to it,” he could become more of an option when the Nets get a 16th player.

Anthony played with Irving, Durant and DeAndre Jordan in the 2016 Rio Olympics. A source told The Post that several veteran Nets were lobbying the front office to sign Anthony, and the Athletic reported Thursday that Irving and Durant were among them.

The 25-game suspension will cost Wilson Chandler $23,316 per game and a total of $582,898 of his $2,564,753 salary. If he fails another PED test, a second suspension would be for 55 games.