Man City and QPR bosses asked to explain ref comments
The Football Association has written to Harry Redknapp and Roberto Mancini over their criticism of referees, reports BBC Sport. QPR boss Redknapp spoke of "scandalous" decisions in the 2-1 Premier League defeat by West Bromwich Albion on Boxing Day.
Both could be charged with improper conduct.
The FA sent letters to both managers, requesting their observations on their post-match comments.