Hakeem Nicks’ poor performance in 2013 wasn’t because he was injured, according to Tom Coughlin. But the reasons for the receiver’s startling decline remain a mystery to the Giants coach.

“Well, it just didn’t happen for him and we’ll all scratch our heads over that one,” Coughlin said in an interview on WFAN on Friday. “Because when Hakeem came back he wanted it more than we will ever know.

“He had certain things happen this year to him. I’m not talking about injuries. I’m just talking about being in situations where the ball would be there and perhaps a couple of times he didn’t go for the ball. A couple of other times he just wasn’t able to get himself open on a continuous basis. It just wasn’t a very productive year.”

Nicks, an unrestricted free agent who is not expected to be back with the Giants, finished with 56 catches for 896 yards and no touchdowns. He was also a season-long example of what Victor Cruz said was an odd “disconnect” between Eli Manning and his receivers. Rueben Randle said he felt it, too.