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The only sure thing about training camp is that players will be injured. We just don’t know when and whom and what body part and how long they’ll be out.

Today, the when and whom point to Jets defensive lineman Muhammad Wilkerson. Via Rich Cimini of ESPN.com, Wilkerson left practice on Sunday. After practice, coach Todd Bowles said Wilkerson tweaked his hamstring.

Wilkerson, in the option year of a rookie contract signed in 2011, wants a new deal. His leverage has increased in recent weeks with the four-game suspension and then the arrest of Sheldon Richardson.

Wilkerson’s leverage could plummet if his injury is anything other than a short-term problem.