US firms McGuireWoods and Kramer Levin Naftalis & Frankel have been mandated to act for FIFA president Sepp Blatter and FIFA's secretary general respectively as the body faces an ongoing corruption investigation.

Blatter (pictured) has hired McGuireWoods chairman Richard Cullen to represent him in the corruption probe that so far has seen nine current and former FIFA officials indicted by the US authorities.

Cullen is a senior litigation partner at the firm and has experience of defending large multinational corporations against US-led investigations.

FIFA's secretary general, Jerome Valcke, has hired Kramer Levin's litigation co-chair New York partner, Barry Berke, who has experience of representing directors and corporations in high-profile investigations and proceedings.

Neither Blatter nor Valcke have been indicted by the US authorities as part of the ongoing investigations.

McGuireWoods and Kramer Levin have joined the growing list of firms acting on matters relating to the investigations.

FIFA has turned to Quinn Emanuel Urquhart & Sullivan's white collar and corporate investigations chair, William Burck, according to The American Lawyer. It is understood that the firm's instruction has been ongoing for the past month.

Clifford Chance New York litigation partner Edward O'Callaghan is advising FIFA vice president Jeffrey Webb, one of the executives under investigation.

Legal Week understands that Swiss firm Niederer Kraft & Frey is acting for another of the officials involved, though the firm declined to comment.