See page 73 here: http://www.fifa.com/mm/document/footbal ... eutral.pdf - if you can figure it out. Seems to me that the ref should have gone over to inspect the wound once the ball went out of play, before letting him on.
Unless he was already satisfied (i.e. only a shirt change needed), in which case I suppose page 22 applies (Rule 4 - Players Equipment). If a player is ordered to leave the field to correct his equipment (ooh err), it does indeed say that he/she is only allowed to re-enter the field of play when the ball is out of play. However, the key phrase for me on this page is "The player at fault". To say any of this was Mellor's fault is harsh to say the least, and in terms of fairness and common sense, I think most people would agree that the ref got it wrong.
Unless he was already satisfied (i.e. only a shirt change needed), in which case I suppose page 22 applies (Rule 4 - Players Equipment). If a player is ordered to leave the field to correct his equipment (ooh err), it does indeed say that he/she is only allowed to re-enter the field of play when the ball is out of play. However, the key phrase for me on this page is "The player at fault". To say any of this was Mellor's fault is harsh to say the least, and in terms of fairness and common sense, I think most people would agree that the ref got it wrong.