Chelsea boss Roberto Di Matteo has criticised Manchester United counterpart Sir Alex Ferguson for getting involved in the Blues dispute with referee Mark Clattenburg. Ferguson publicly rubbished Chelsea's accusation that the referee racially abused John Obi Mikel during last week's defeat to Manchester United.
Di Matteo said: "He likes to talk about other clubs. We tend not to. I'll leave it up to him.
"It's a free country where everybody has the freedom of speech. We'll take into consideration what other people say and use it as a motivational tool for ourselves."
Asked whether there was a possibility his players had misheard Clattenburg, the Chelsea boss said: "I think the investigation will clarify that.
"We cannot comment because we do not want to prejudice any investigation. We will have to wait and see what comes out."
