<human>:  Why did Manchester United lose to Chelsea in the 2007–08 season?
<bot>: Chelsea won the game 3–0, with goals from Nicolas Anelka, Didier Drogba, and Michael Ballack. The loss was a big blow to Manchester United, as it knocked them out of the Champions League. The team also had a poor start to the Premier League season, which led to manager Alex Ferguson resigning.