He cited ex-Bluebirds Roger Johnson and Warren Feeney as players to have suffered the sort of hip problem Ledley, 22, has complained of.

BBC: Joe Ledley and Michael Chopra doubts for Cardiff trip

Richards, along with former England skipper Martin Johnson, New Zealander Warren Gatland and South African Nick Mallett, have all been linked with the role following Robinson's departure on Wednesday.

BBC: SPORT | Rugby Union | Catt backs Richards for England

He leads the book's Hail to the Cheats section, which also features Richard Nixon, Warren Harding and Johnson.

NPR: 'First Off the Tee': White House Golf Tales