It’s the first day of training camp, and the Giants have already had their Snacks taken away.

That’s Snacks with a capital S, as in the nickname for hefty defensive tackle Damon Harrison, one of the key free-agency additions made by the team this offseason. Harrison is one of three players who are starting camp on the physically-unable-to-perform list. He’s joined there by linebacker J.T. Thomas and fellow defensive tackle Jay Bromley.

Others may join them by the end of the day, but that won’t be until after the coaches and medical staff get to see them perform in a conditioning test on Thursday afternoon. Chief among the players whose performance in the typically mundane activity will create a stir is Victor Cruz, coming back from calf surgery last year and a torn patellar tendon in his knee the year before that. Cruz has been aiming toward a return for the start of camp.

“He looked good today when I saw him,” Ben McAdoo said of Cruz before the conditioning test. But he also said that Cruz’s participation in the conditioning test — or anyone else’s for that matter — does not mean he won’t start camp on PUP.

“We want to look at them moving around first,” the coach said.

Even if Cruz does pass, it’s likely the Giants will ease him back into the action. They were extremely cautious with his progress in the spring.

As for the three already on PUP, McAdoo said none of them seem like long-term concerns. Harrison had swelling in his knee, which McAdoo said likely is the result of past surgical procedures and new training exercises. Thomas has been nursing a hamstring injury since the spring, and Bromley had ankle surgery this offseason.

advertisement | advertise on newsday

“We don’t think any of them are extremely serious at this point,” McAdoo said.