FLORHAM PARK, N.J. - Muhammad Wilkerson left practice Sunday after tweaking a hamstring.

The Jets defensive end -- who currently is seeking a long-term contract extension -- was spotted walking off the field with a trainer and toward the locker room. But it wasn't until after practice that Todd Bowles disclosed the injury.

"I think he tweaked his hamstring as far as I know," the coach said. "They took him inside just to stretch him out."

Bowles downplayed the severity of Wilkerson's injury but couldn't say for certain if he will have to sit out a few practices. "I hope not," Bowles said. "They're off [Monday] and I didn't think it was serious. If it loosens up, he'll be OK. Shouldn't be out long."

Marshall meets Revis Island

The Darrelle Revis-Brandon Marshall matchup was worth the price of admission for Jets fans. For the first time in camp, the Jets' No. 1 receiver and No. 1 cornerback squared off in practice, and the crowd loved every second of it.

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Revis lined up against Marshall seven times -- five times in one-on-one red-zone drills and twice more during the team period. But while the fans cheered on the physical battles between Revis and Marshall, Bowles refused to get caught up in the moment.

"I mean, I'm not playing PS4," he joked, referring to the PlayStation video game console. "These guys have got to play. I have to look at a whole bunch of things. I'll look back and retire and be like, 'Wow, I had those two guys.' Right now, I can't do that."

Jet streams

The Jets signed former Syracuse wide receiver Jarrod West . . . According to Bowles, "about 35, 40 percent" of the Jets' defense has been installed. "You have to see if people have recall," he said. "You have to get a lot of people reps. You put stuff in and see how they do it and correct it and then move on from there." Bowles said he expects to have the entire defense installed by the first preseason game but noted: "The majority of it should be in -- not game plan-wise, but just defensive-wise." . . . Wide receiver DeVier Posey (hamstring) was held out of practice but "he is close to returning,'' Bowles said. "We're trying to be careful with him."