Jadar Johnson, an undrafted rookie safety from Clemson, left training camp and has retired from football.

“My reaction is I wish the man nothing but the best,’’ coach Ben McAdoo said after practice Sunday. “He’s a young man that has a bright future ahead of him.’’

McAdoo said he had “a personal conversation’’ with Johnson before Johnson’s departure.

Johnson’s agent, Trey Robinson, released a statement that, in part, explains the retirement as involving health concerns.

“After seriously weighing his options, Jadar has decided to retire from football today to pursue other interests,” the statement said. “This was not an easy decision for him to make, but it is the right decision for him. He has new ventures that he wants to pursue and he values his health. Jadar is very grateful to the Giants’ organization for the opportunity they provided him.’’