when the player criticize his coach tactics

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after losing against ajax, Micah Richards criticize his coach tactic, Roberto Mancini Micah richards admit that his team-mate is hardly adapting with the defending scheme was used the coach.. In earlier matches, Mancini use the classic tactics, 4-4-2 with the defender, Micah Richards, Vincent Kompany, joleon lescott and Gael clichy but in the middle games, mancini changes with the scheme 3 defenders and sometimes become 5 defender with full back supporting.. Richards said it`s new things for every defender in city..he said " we are familiar with 4 defenders in the game" but he added that Mancini likes the tactics and maybe the player should learn the tactics harder does it deserved any player criticize his coach tactics in press conference or when asking the question from the journalist?? don`t it make the situation become worst??