Graeme Souness has questioned Gary Neville’s claims after the Manchester United legend made a powerful doping accusation that Roy Keane agreed with him on. Gary Neville enjoyed incredible success at Old Trafford and lifted two Champions League titles with Manchester United under former manager Sir Alex Ferguson. Roy Keane also lifted a Champions League trophy at United, with the Irishman and Neville both being key parts of Ferguson’s iconic treble-winning team in 1999. But Neville and Keane opened up on the Red Devils’ difficulty in Europe, with the pair defending one of their ex-United teamma…