Litigators from Davis Wright Tremaine, Gibson, Dunn & Crutcher and Quinn Emanuel Urquhart & Sullivan have been retained in the aftermath of a controversial investigative report aired by Al Jazeera America on Sunday night that accuses several high-profile U.S. athletes of obtaining performance-enhancing substances.

William “Bill” Burck, co-managing partner of Quinn Emanuel’s office in Washington, D.C., and co-chair of the firm’s white-collar and corporate investigations group inside the Beltway, is advising Major League Baseball players Ryan Howard of the Philadelphia Phillies and Ryan Zimmerman of the Washington Nationals. Both players have publicly denied accusations in the Al Jazeera story claiming that they used a hormone supplement called Delta-2, and their respective teams have each issued statements expressing support for their players.