CHARLOTTE, N.C. — Panthers Pro Bowl linebacker Thomas Davis said he has been suspended by the NFL and will miss the first four games of next season after testing positive for a banned substance.

Davis posted a video on his Twitter account on Friday saying that he tested positive for an estrogen blocker.

“I was completely caught off guard by this,” said the 35-year-old Davis. “I have never done anything to intentionally try to cheat the game. It’s one of those situations where the NFL rules are clear. They state that you are responsible for what you put into your body.”