The person spoke to The AP on condition of anonymity Monday because the Dolphins hadn't commented on the test results.
Pouncey left Sunday's game against the New York Giants during the second half with a neck injury after taking a blow to the head. Pouncey said he briefly couldn't feel his legs, but that he felt fine after the game.
With Pouncey out, the Dolphins gave up four sacks in the fourth quarter, blew a late lead and lost to fall to 0-7. They next play Sunday at Kansas City.
Copyright 2011 by The Associated Press