FLORHAM PARK, N.J. — Jets tight end Kellen Winslow was suspended for four games for violating the league's policy on performance-enhancing substances on Friday.
"It came as a huge surprise to me when I learned that I tested positive for a banned substance," Winslow said in a statement issued by his publicist.
"I have investigated all possible sources since learning of the positive test, including possible medical causes. But frustratingly, I do not know the source. I do not take supplements that list any banned ingredients."
The league does not disclose the substance when it suspends players.
Winslow, an ex-Buc, has a team-high 17 catches for 169 yards. His two touchdown catches are tied for the team lead.
More Jets: Starting cornerback Antonio Cromartie was diagnosed with a hyperextended knee a day after sustaining a noncontact injury at practice. He will be a game-time decision.
Bears: Starting linebacker D.J. Williams is out for the season after tearing a pectoral muscle Thursday against the Giants. The team said it isn't sure how the former Miami Hurricane was injured. Jonathan Bostic, a second-round pick out of Florida in April, likely will replace him.
Bengals: Starting defensive end Michael Johnson fully practiced for the first time since sustaining a concussion last week against the Patriots. He is questionable for Sunday.
Bills: Receiver Stevie Johnson, dealing with a sore back, will be a game-time decision. Cornerback Stephon Gilmore, out since the preseason with a broken left hand, also will be a game-time decision.
Broncos: All-Pro cornerback Champ Bailey, out since spraining his left foot against the Seahawks on Aug. 17, is set to return Sunday. Also, starting linebacker Wesley Woodyard was declared out with a shoulder stinger sustained last week against the Cowboys. Paris Lenon will replace him.
Cardinals: Star receiver Larry Fitzgerald is questionable with a sore hamstring. It's a different hamstring injury than the one that kept him out of a game earlier this season.
Giants: An X-ray on running back David Wilson showed one of his vertebra has moved closer to his spinal cord. Wilson has felt tingling in his body since being tackled hard Sunday against the Eagles, and he sat out Thursday against the Bears. The team said Wilson will get a second opinion before his status is determined.
Jaguars: Leading receiver Cecil Shorts returned to practice a day after sitting with a groin injury and will start Sunday.
Raiders: Running back Darren McFadden, who hurt his hamstring in Week 4, practiced for the third consecutive day but likely will be a game-time decision.
Ravens: Left tackle Eugene Monroe, acquired from the Jaguars last week, is expected to make his first start Sunday. He would replace Bryant McKinnie. Also, defensive tackle Haloti Ngata returned to practice after missing two days with a sore hip.
Seahawks: Starting center Max Unger will return Sunday after missing two games with a strained triceps.
Vikings: Christian Ponder, recovered from a broken rib, will be the No. 2 quarterback behind Matt Cassel on Sunday. The team previously said ex-Buc Josh Freeman would not be ready to play.
Fines: Lions defensive tackle Ndamukong Suh lost his appeal of a $100,000 fine for going after Vikings center John Sullivan's knees during an interception return in the season opener. Also, Cowboys defensive lineman and former USF star George Selvie was fined $7,785 for grabbing Broncos quarterback Peyton Manning's face mask last week. Packers and former Florida linebacker Brandon Spikes was fined $7,785 for wearing red shoes last week. And safeties Will Hill of the Giants and Jerron McMillian of the Packers were fined $15,750 for hitting a defenseless opponent in the head last week.
Blackouts: The Chargers' home game Monday against the Colts "very likely" won't be seen in San Diego, the San Diego Union-Tribune reported. The team has not accepted the NFL's offer to lift the blackout if 85 percent of nonpremium seats are sold. Meanwhile, the Bills, who got an extra day to avoid a blackout, said they will buy enough tickets to ensure the game will be seen in Buffalo.