Tequila, anyone?

In a 23-minute documentary that went online Thursday about his rehab, Janis Porzingis, Kristaps’ brother and agent, revealed the night of the ACL-tear diagnosis, his entourage needed a ceremonial shot to absorb the devastating news.

Janis said he took a tequila bottle and poured shots for his brother Martins, Kristaps and their longtime physiotherapist, Manolo Valdivieso.

“That night we got back home, we made four shots,’’ Janis said. “I just said: ‘To a new beginning.’ We drink the shot and started the next day as a new beginning. That’s what we did.”

“The shock moment. I would say lasted for a day and half,’’ Janis added. “When you know those things happen, you never think it’s going to happen to him. It’s a shock. You can’t believe that’s happening actually.”

Sources have indicated Porzingis will miss between 10 and 12 months, but owner James Dolan didn’t rule out the 7-3 Latvian missing the season in an exclusive interview with The Post’s Larry Brooks on Wednesday.

In the documentary, none of the cast mentioned the possibility of Porzingis missing next season.

“I felt like s–t,’’ Martins said when he learned the diagnosis. “I feel the same pain as he feels — heartbreaking. When I saw that injury and MRI after, I was OK. He’ll miss this season. But the way his mentality is, I don’t have doubts next season he’ll be better than he is right now. He’ll have a chance to study the game and work on the upper body and no doubt be even better and stronger.’’

In the opening of the documentary, Porzingis details the Feb. 6 night his dunk on Giannis Antetokounmpo turned tragic.

“I wake up that day feeling great, energy was high,’’ Porzingis said. “I was ready, excited for the game. It’s just an unlucky play. I got Giannis on the backdoor. I went up to dunk it hard. I saw him little behind me. He jumped late as I came down. I felt a little bump on my knee from the side. And at the moment my knee buckled in — a short move and was quick. I felt a sharp pain. My first thought, it wasn’t a torn ACL. A few minutes later, I told doctors I was ready to go back in.”

None of the Knicks players or staff appeared in the film. Performance doctor Carlon Colker, a Greenwich, Conn., practitioner who does not work for the Knicks, was one of the main characters, detailing the assorted weight-training work he’s doing with Porzingis.

However, Porzingis took his rehab to Latvia last Saturday. Colker told The Post he will spend some time with him in Latvia later this summer.