Manchester United boss Sir Alex Ferguson admits he spoke with Dimitar Berbatov prior to benching him for yesterday's derby.
Berba was a second-half substitute in the 2-1 win over Manchester City.
"I had to sit Dimitar down and tell him he was not starting," said Ferguson.
"I did not enjoy that. It was a difficult decision but we had to pay attention to the number of players they put in midfield, plus Silva floating.
"What I need to get out of Wayne and Berbatov is performances away from home. They have not been as good as they have been at home.
"With the ability those two have, they really should be dictating games for us.
"When they do, it will make a hell of a difference to Manchester United."
