Published: Aug 27, 2012 9:17 PM EDT
Updated: Aug 28, 2012 6:31 AM EDT

DAVIE, Fla. (AP) - A person familiar with Jake Long's right knee injury says the Miami Dolphins' Pro Bowl tackle isn't seriously hurt.

The person said an MRI exam confirmed damage was minor. The person spoke to The Associated Press on condition of anonymity because the Dolphins didn't comment on the injury.

Long left practice Monday after he went down in a pile on a pass play. He was examined by a trainer, walked off the field and sat in a cart on the sideline for further examination, and then walked to the locker room.

Back trouble slowed Long last season, and he went on injured reserve before the final game because of a torn right biceps. He nonetheless was chosen a Pro Bowl starter at left tackle for the third consecutive year.