Former skipper Michael Vaughan fears not all England players have fully adapted to the existing team culture and feels the backroom staff is "made up of cheerleaders".
Vaughan suggested England must carry out an honest review of their 1-4 mauling in India by taking a leaf out of Manchester City boss Pep Guardiola's book to breed an environment of ruthlessness.
India completed a magnificent series triumph with an innings and 64-run victory inside three days in the fifth and final Test here on Saturday.
