Sunderland boss Martin O'Neill has backed suggestions that referees are to be ordered to punish all two-footed challenges with red cards.

Amid a brewing row over the interpretation of the laws governing tackling, which saw Manchester City defender Vincent Kompany dismissed in the FA Cup clash with Manchester United, but not Liverpool's Glen Johnson for a similar incident against City just days later, O'Neill has called for greater clarity.

He said: "There's a bit of ambiguity about it, really, and I think what they are doing now is going to come down hard on two-footed challenges."

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