Manchester United boss Sir Alex Ferguson is wary of over-hyping tonight's derby for his players.
Amid the heightened intensity of Wednesday night's showdown, Ferguson insists he will not lose sight of the real barrier to United's hopes of glory this term.
"If you don't recognise who won the league last season then you are very foolish," he said. "We have to chase Chelsea. That is our challenge.
"It is not easy winning our league and they are a very formidable and experienced side."
