The National Football League suspended New York Jets tight end Kellen Winslow Jr. for violating the league's policy on use of performance-enhancing drugs.
Winslow, who leads the Jets with 17 receptions this season, will be required to sit out the team's next four games, Newsday reported.
He said the news he tested positive for a banned substance "came as a huge surprise to me."
"I have investigated all possible sources since learning of the positive test, including possible medical causes, but frustratingly, I do not know the source," he said in a statement. "I do not take supplements that list any banned ingredients, but the NFL policy is very strict, so I am accountable for the results."
"Guys, we got to look at it this way: We have a really good tight end in Jeff Cumberland," Ryan said of Winslow's absence. "The guy's a young stud tight end."
Winslow will next be eligible to play Nov. 17 in Buffalo.