FLORHAM PARK, N.J. - The only workout Muhammad Wilkerson took part in was on the stationary bike.

"He's day-to-day," Jets coach Todd Bowles said yesterday of his star defensive end, who left Monday's practice with a tweaked hamstring. At the time, Bowles didn't seem too concerned about the injury. But Tuesday, he sounded unsure of when Wilkerson will be able to get back on the field. "If he's feeling OK. It's tight. On day-to-day [injuries], we err on the side of caution rather than the other side. Hopefully he will, but it's day-to-day right now."

Wilkerson, 25, has been seeking a long-term contract extension with the Jets since 2014. He's currently under contract and will earn $6.9 million for this season.

No rush on Ridley

Stevan Ridley remains on the active/PUP list and Bowles has no plans on speeding up the running back's recovery. Asked for a progress report, Bowles said of the former Patriot: "He's running sprints and that's all he's doing . . . Until he's able to cut and everything, you won't see him. When we signed him, we knew it was going to be a rush. We're not trying to rush him back."

Even with Ridley unable to practice, the Jets have a crowded backfield with Chris Ivory, Bilal Powell, Zac Stacy and Daryl Richardson.

High-tech times

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There was a new addition to the practice field -- a camera tripod. The Jets were testing out the equipment as part of a virtual-reality system that several NFL teams, including the Minnesota Vikings and Dallas Cowboys, have been experimenting with. The tripod was positioned near the quarterbacks during seven-on-seven drills.