FLORHAM PARK, N.J. — The Jets’ already thin defensive backfield may have taken a big hit Sunday.

Cornerback Trumaine Johnson suffered a hamstring injury after picking off Sam Darnold and running it back. He left practice and will have an MRI.

Coach Adam Gase has downplayed some injuries during training camp, but he seemed a little more concerned about Johnson.

“Any time a guy that makes a living running has a hamstring [issue], you just kind of see how it goes,” he said. “We’re just going to have to get him a lot of treatment, keep strengthening him up and get him back as fast as possible.”

Johnson, who missed games last year with a quadriceps injury, had been having a good camp, but cornerback is considered the Jets’ weakest area. Darryl Roberts is the other starter, Brian Poole is the slot corner and undrafted rookie free agent Kyron Brown could make the jump to starter if Johnson misses extended time.

Gase has been impressed with Brown, who has been taking second-team reps. The cornerback depth chart beyond that includes Parry Nickerson, Tevaughn Campbell, Arthur Maulet and Dee Delany.

General manager Joe Douglas probably already was looking to add depth, but Gase said defensive coordinator Gregg Williams will make sure the players who make the 53-man roster are ready to play.

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“We’ll just keep rotating guys in there,” Gase said. “We’re going to keep competing. That’s what we’re going to have to do. We need some young guys to step up. They’re going to have to play well.

“The good thing is with an experienced defensive coordinator like we have, Gregg knows how to get guys into a rhythm, find out what they do well, adapt his scheme to our personnel.”

More injury news

Right guard Brian Winters (shoulder) is “week to week” with a shoulder issue, Gase said. Winters suffered the injury in Thursday’s loss to the Giants . . . DE Leonard Williams did some individual drills but missed most of practice with a hip injury that sidelined him last week. Gase said the Jets will take it easy with Williams. “We’re going to be slow with that,” he said. “Make sure he’s all right before we get him going again.” . . . LB Avery Williamson didn’t practice because of a foot injury he suffered Thursday. Rookie Blake Cashman was slowed by a calf/ankle injury.