NFL player Jeremy Kerley was suspended last month after testing positive for a performance-enhancing drug.

A month later, still confused about his test results, Kerley said he now believes a ghost "tainted his pee".

"I don't know," Kerley said when asked how a banned substance got into his system. "There's a lot of ghosts around here".

"Ghost put it in there. You know, the ghost of Christmas past? … I don't know."

At the time of his suspension, Kerley said he was "shocked" to learn he tested positive for Turinabol, an anabolic steroid, and that he never "knowingly" had taken.

Advertisement

"I am 5-foot-9 tall and 180 pounds, and I have never used steroids in my life. I'm a good athlete, but anyone can look at my body composition and tell that I'm not a steroid user," he said.

Read more:
Snow blankets NFL clash between Buffalo Bills and Indianapolis ColtsAmerican Football Hawke's Bay set to become affiliated
Mike Pence posts old photo before walking out on kneeling NFL players and tweeting his anger

"I fully intend to investigate this matter until I am able to figure out what caused the positive test, because I know that I have done nothing wrong."

Although Kerley has now served his four-game suspension he has not been put back on the active roster, keeping him on the reserve/suspended list until next week.