* ensures that any ball used meets the requirements of Law 2 * controls the match in cooperation with the assistant referees and, where applicable, with the fourth official * If a substitution is made during the half-time interval or before extra time, the procedure is to be completed before the second * If a player who is about to be replaced refuses to leave the field of play, play continues. * A substitute who has not completed the substitution procedure by setting foot onto the field of play cannot restart play by taking * Permission to proceed with a substitution may be refused under certain circumstances, e.g. * The player being substituted is not obliged to leave the field of play on the halfway line * Before entering the field of play, the substitute waits for the player he is replacing to leave the field * The referee gives the substitute permission to enter the field of play * The player being substituted receives the refereeâ€™s permission to leave the fi eld of play, unless he is already off the field of play for reasons that comply with the Laws of the Game * The assistant referee signals that a substitution has been requested * A substitution may be made only during a stoppage in play

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