The Blues, knowing a win would put them in the last 16, led through John Terry's header after 86 seconds.A slick move ended with Willian driving in the second, before Schalke defender Jan Kirchhoff headed into his own net as Chelsea led 3-0 at half-time.Didier Drogba tapped in before setting up Ramires to head in the fifth.Chelsea substitutes Drogba and Ramires netted in the last 15 minutes to cap a flawless performance that merited the emphatic scoreline for the visitors in Gelsenkirchen.The Blues' superiority in the Premier League, where they are unbeaten in 12 matches and lead by six points, has led some to ask whether they can go through the entire top-flight season without losing.On this evidence, as the Blues starved Schalke of possession and then regularly sliced them apart in attack, Jose Mourinho's men could also be a difficult team to beat for Europe's elite.Mourinho is Chelsea's most successful manager after winning six trophies in his first spell at Stamford Bridge between 2004 and 2007, but was unable to land the one prize craved by Blues owner Roman Abramovich - the Champions League.Instead, it was Di Matteo who lifted the biggest prize in European club football when he masterminded Chelsea's victory in the 2012 tournament.But if Chelsea continue to produce this quality of performance when the knockout stage resumes in the new year, then Mourinho will believe he can join the Italian in turning the west London side into European champions.German side Schalke produced an abject performance riddled with defensive errors. But their mistakes were brutally exploited by Chelsea's desire, sharpness and invention.Before kick-off, Mourinho stressed the importance of sealing their last-16 place with a win - and rendering the final group match against Sporting Lisbon meaningless.Bakudaily.Az