(Reuters) - The NFL has set an Aug. 25 deadline for four players to meet with the league regarding allegations of doping or they face the prospect of being handed suspensions, it was reported on Monday. Green Bay linebackers Clay Matthews and Julius Peppers along with Pittsburgh's James Harrison and free agent Mike Neal are facing punishment for their failure to speak with the NFL regarding an investigation into their use of performance enhancing drugs. Adolpho Birch, the NFL's senior vice president of labor policy and league affairs, sent a memo to the NFL Players Association warning that suspensions would take effect on Aug. 26 if the players failed to cooperate.
