The Football Association are looking into comments made by Sir Alex Ferguson and Sam Allardyce about the refereeing in their team's matches at the weekend.
Ferguson questioned referee Alan Wiley's fitness after Manchester United's 2-2 draw with Sunderland, while Allardyce criticised Peter Walton for not giving a penalty for Thomas Vermaelen's apparent trip on David Dunn in Blackburn's 6-2 defeat at Arsenal.
A spokesman for the FA said: "We are reviewing the comments in their full context."
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