Antonio Cromartie left Monday night's game midway through the fourth quarter with a groin injury.

He said afterward that he felt fine and expects to play Sunday against San Diego. Cromartie added that no tests were planned for the injury.

It is unclear when Cromartie got hurt.

What is clear is that he got burned -- and bailed out -- by Dolphins wideout Brandon Marshall.

Late in the first quarter, Marshall beat Cromartie badly and found himself wide open down the sideline. Dolphins quarterback Matt Moore hit him in stride but Marshall inexplicably stepped out of bounds at the Jets' 19, ruining what should have been an easy 65-yard touchdown.

Other than that, Cromartie, wasn't targeted as much as usual on Monday.

Oddly, Miami coach Tony Sparano had Moore throw to Marshall, who was covered by Darrelle Revis, again and again.

Cromartie could have his hands full next Sunday when San Diego comes in to town. He'll either have to cover Chargers receiver Vincent Jackson or Malcom Floyd.

The veteran corner spent four years in San Diego before the Jets acquired him in a trade prior to the 2010 season.

So he should have plenty of motivation to get healthy for Sunday's game.

"We're playing San Diego so I'm expecting that he'll heal quickly," Rex Ryan said.