John Mara has “no idea’’ when Jason Pierre-Paul will report to training camp. Mara acknowledged it was “very disappointing to him’’ that Pierre-Paul refused to see two team officials who traveled down to Florida to check on his physical condition, and revealed no one from the organization has even seen Pierre-Paul’s damaged right hand.

And Mara, the Giants’ co-owner, is concerned about not only Pierre-Paul’s condition but the counsel the 26-year old defensive end is receiving.

“I don’t think JPP is receiving very good advice right now,’’ Mara on Tuesday told The Post’s Steve Serby.

Like everyone else, Mara was shocked to hear that Pierre-Paul suffered a serious injury while shooting off fireworks at his Florida home on July 4.

“He has told people that he’s fine and he’s going to be ready to play, but until we see the hand, we’re just not sure,’’ Mara said in his first public comments about Pierre-Paul’s situation.

Whether Pierre-Paul ever will be “fine’’ again remains to be seen. He had to have his right index finger amputated – the knuckle was removed as well – and he suffered fractures to his right thumb and severe burns that required skin grafts. There is no known timetable for his return. The Giants report to training camp on Thursday, and Pierre-Paul is not expected to attend.

“Well, the first thought and concern we all had was for JPP’s well-being. After that, I think I may have used some language that I wouldn’t like my grandchildren to hear me use,’’ Mara said of his initial reaction to the news. “I could not believe, that here we haven’t even gone to training camp yet and we’ve lost two starters — one [left tackle Will Beatty] in the weight room and one to a fireworks accident. So it was more of a state of disbelief that I was in. I’ve been around a long time, seen a lot of things … but this one was a shock.’’

Pierre-Paul shunned the outside world in the days after the accident, not responding to calls and texts from teammates. Mara said he sent Pierre-Paul a text shortly after the accident, asking him about his condition and offering any help the team could provide.

“He texted me back right away, said he was going to be fine, that it’s just a little bump in the road and that he’ll be back as good as ever,’’ Mara said. “I know Jerry [Reese] has texted him and I know he’s had some communication with Robert Nunn, his defensive line coach, and I think Ronnie [Barnes] spoke to him recently.’’

Barnes, the Giants’ longtime senior vice president of medical services, is one of the most respected members of the organization. Barnes and former Giants linebacker Jessie Armstead, now a special assistant, were rebuffed by Pierre-Paul when they tried to visit him in a Miami hospital in the days after the incident.

“The fact that they went down there and hung around for two days and were not allowed to see him was very disappointing to me,’’ Mara said.

Pierre-Paul has not yet signed his franchise tender of $14.8 million. The Giants have not rescinded that offer, but they also are not about to leave it on the table without first examining the player.

“We obviously are going to have to see him first and determine whether or not he’s capable of playing this year before we take one step further,’’ said Mara, who added it is not appropriate to even consider a long-term deal at this time.

The Giants have tried to determine what Pierre-Paul will have to deal with as a nine-fingered NFL defensive lineman. Mara said Barnes has spoken to “a number of doctors,’’ but there is little data on this particular injury.

For now, Mara would like to see Pierre-Paul show up later this week at the team facility.

“We’d like him to come in and report, and at the very least, learn the new defense that Steve Spagnuolo is putting in,’’ Mara said. “And to have some of the best doctors in the world, who are located within a few miles of this place, take a look at him and see if there’s anything further that can be done to help him.’’