(Reuters) - The National Football League has rejected written statements from four players named in a report alleging use of performance-enhancing drugs as sufficient cooperation and will need to interview them, the league said on its website on Friday. Pittsburgh's James Harrison and Green Bay players Clay Matthews, Julius Peppers and Mike Neal have given written statements regarding a December report by Al Jazeera America that they received the illegal drugs from an anti-aging clinic. The NFL Players Association has argued that there should be no need to interview someone based on an allegation that has no proven merit.
