It's impossible to say whether or not Clattenburg is biased one way or the other. However, this is what Graham Poll said at a football writers dinner the other night:
Graham Poll was guest speaker at the Football Writers' Association dinner in Manchester last weekend. In truth, it wasn't a great speech, starting off with the now-obligatory joke about the first rule of refereeing being to award Manchester United all the stoppage-time they want. A few minor laughs followed but, at times, it was difficult not to think his perception of the job was a little blurred, particularly when he talked about the buzz it would have given him to send off a player at Wembley.
Like anyone else, referees have egos. They want to feel relevant. In this respect, Clattenburg surely feels pretty good about himself right now.