Howard Webb has spoken for the first time about the match in which Fabrice Muamba collapsed and warned players that feigning injury could risk tragedies taking place in the future.
Webb warned that referees may be reluctant to stop the game if they believe that a player is "crying wolf" - and any delay could have been fatal for Bolton midfielder Muamba. England's top official was refereeing the Tottenham v Bolton FA Cup match in March when Muamba fell to the ground after suffering a cardiac arrest.
Webb, at the FIFA medical conference in Budapest, said in an interview: "I turned and saw Fabrice Muamba lying face down on the floor with no-one else nearby - this was clearly a major concern and clearly something more than a normal injury."
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