The Football Association have confirmed they have written to Roberto Mancini and Harry Redknapp over their criticism of referees following Manchester City and QPR's Boxing Day defeats.
The FA sent letters to City boss Mancini and Rangers counterpart Redknapp requesting their observations on their post-match comments in the wake of their sides' respective matches against Sunderland and West Brom.
Mancini and Redknapp could both find themselves charged by the FA if their words are found to have amounted to improper conduct.
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