The Jets' front office is breathing a collective sigh of relief.

An MRI in Sunday revealed rookie defensive end Leonard Williams suffered a muscle strain behind his right knee, per a source.

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Williams, who was forced to leave Saturday night's game against the Giants in the second quarter, did not suffer any ligament damage, so the injury is not expected to be long-term.
That's good news for the Jets, who already will be without defensive tackle Sheldon Richardson for the first four games of the regular-season because of a substance-abuse suspension. There's also a very good chance the league hands down another suspension following Richardson's July arrest in Missouri.

Williams, the sixth overall pick in this year's draft, limped off the field in the second quarter of an eventual 28-18 Jets win in the annual Snoopy Bowl at MetLife Stadium. Williams walked off under his own power, but he was escorted to the locker room by a member of the Jets' medical staff. The initial announcement in the press box was that the former USC pass-rusher was questionable to return to the game, but the rookie never made it back onto the field.
A league source said late Saturday night that it's possible Williams suffered a bone bruise, but a proper diagnosis would not be known until the rookie underwent an MRI.

As of now, it's unclear how much time Williams could miss due to injury. Their third preseason game against the Giants was most likely the final dress rehearsal for starters before the regular season begins on Sept. 13. Thursday's preseason finale against the Eagles will feature second and third-string players vying for roster spot.