INDIANAPOLIS – Knicks rookie phenom Kristaps Porzingis hasn’t made a final decision on whether to play for Latvia in July, but admitted he is leaning toward staying with the Knicks coaching staff to bulk up.

“It’s a big offseason for me,’’ Porzingis admitted.

Porzingis’ rookie year, during which he created as big a Garden buzz as any rookie since Patrick Ewing, will end with him missing the final seven games due to a right shoulder strain that became more cumbersome than he originally thought. The 7-foot-3 shotblocker will miss Tuesday’s season finale in Indiana, meaning his next putback dunk could be in the Vegas summer league rather than an Olympic qualifier.

“It sucks not playing the last seven games,’’ the 20-year-old Porzingis said at the morning shootaround Tuesday at Bankers Life Field House. “I was expecting myself to be back and ready to go the last two, three games. It’s not the right decision to make right now, to rush and play. Something worse can happen. It sucks, but at the same time, you have to be smart about it in and listen to the medical staff.’’

According to a source, Porzingis had hoped soon after the season ended to take off for his home in Latvia and then visit friends in Seville, where he played three seasons in Spain. But the Knicks have asked him to delay the journey until they know his shoulder is healed, so he may be in town for another few weeks.

“I’ll stay here until I’m 100 percent,’’ Porzingis said.

Knicks interim coach Kurt Rambis publicly lobbied for Porzingis to snub Latvia so he can stay in New York and get stronger with training staff. The time commitment to the national team, which includes a training camp, would be more than three weeks.

“Most of the offseason, I’ll be in New York,’’ Porzingis said. “I have great coaches. We have Kurt, Phil [Jackson]. To learn from those guys, it’s fundamental for me, especially my first offseason. They have a pretty clear idea on what they want me to work on.’’

Latvia placed Porzingis on its extended roster. Porzingis says he wants a few more days to sit down with family and think about it, but conceded skipping the Olympic play may be the best route. Porzingis will meet with Jackson, Rambis and GM Steve Mills in an exit meeting Thursday.

“Soon I’ll really sit down with my family, my brother Janis and make that decision,’’ Porzingis said. “Of course the organization, they’re the people I have to listen to, and I’ll sit down and make a decision.

“No. 1 is the team. Obviously I want to represent my country and Latvia, but I have to be smart about it. I have to listen to the people who are important. I haven’t decided 100 percent yet. I’ll sit down, calm, and make a decision.”

Considering he was billed as a project after being drafted fourth overall because of his rail-thin build, Porzingis had a dynamite rookie year and should finish second in the Rookie of the Year voting to Timberwolves No. 1 pick Karl-Anthony Towns. He lost weight as the season wore on, so adding about 20 pounds to his 235-pound frame would be a good start.

There is a debate on how hard Porzingis hit the rookie wall in late February and March — Jackson even said in March that Porzingis hit a “wall’’ — or whether Rambis adjusting his minutes and designated spots on the floor in the offense also were factors in his declining play. Porzingis finished out the season with a double-double in three of his final four games, but before that, had none under Rambis.

In playing 72 of 82 games, Porzingis finished averaging 14.3 points, 7.3 rebounds and 1.9 blocks.

“Not effective enough so we can win and be in the playoffs,’’ Porzingis said when asked to reflect on his first season. “I tried to do the best I could. Things I know I could do: rebounding, scoring, block shots. I think I could’ve had a better year and done things better. That’s how you learn. Now I see what I’m missing from my game where I can be more effective and work on being a better player next season.’’