The Arsenal 'invincibles'; a team widely regarded as one of the best ever. But the class of 2003-2004 have new challengers for that title.
Chelsea this season have one of the strongest squads the Premier League has seen for a long while; the balance they have in their starting eleven is nothing short of perfection. But can Jose Mourinho's team go the whole season without suffering a single defeat in the league?
Chelsea put on another brilliant display against last year's runners up Liverpool at the weekend, coming away with a 2-1 win over the Reds, and have now faced all the so-called contenders for the Premier League title.
With all their main rivals out of the way for the first half of the season, you would expect the central London club to extend their lead at the top of the division.
Mourinho's side hold bags of quality all over the pitch, the core of the squad is so formidable and it makes it hard for the opposition to break them down. Starting with their keeper, Thibaut Courtois, the Belgian is regarded as one of the best in the world and you can see why with recent performances.
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The ease in which he comes out to gather the ball puts other 'keepers to shame and it makes the life of the Chelsea back four so much easier. He had big boots to fill considering he is the successor of Petr Cech, but it looks like the transition has been more seamless than many would have expected.
The Blues have one of the best defensive records in the league and the individuals in that back four are worthy of that record. Branislav Ivanovic is probably the best right back in the division at the moment, not only staying back, but going forward as well.
The Serbian has netted two goals already so far this season and the way he flies forward causes huge problems for opposing teams. In the centre Gary Cahill and John Terry are the leaders of the back line; the Englishmen have been rocks at the rear of the pitch and don't look like crumbling any time soon.
The strengths, however, do not end at the defence. Nemanja Matic is currently one of the best defensive midfielders in the world and with summer signing Francesc Fabregas capable of playing alongside the Serbian, the two ahead of the aforementioned defence just add to the solidity.
The attack does the business at the end other end of the field. Oscar is developing into one of the best attacking midfielders in world football, and with his exquisite finishing and tough tackling you can see why Mourinho chose the little Brazilian over now Manchester United player Juan Mata.
Winger Eden Hazard also has undeniable quality. He can produce that moment of magic at any time with his quick feet and blistering pace; the 23-year-old is up there with the best wide players in Europe.
Of course, you cannot talk about Chelsea without mentioning Diego Costa, with the striker having scored ten goals so far this season, all in the Premier League. Again he had big boots to fill after people were comparing him to the club legend Didier Drogba and those comparisons haven't intimidated the ex-Atletico Madrid man.
With this team, no one can dispute Chelsea have the talent to emulate the Arsenal 'invincibles', but going a whole season without suffering a defeat is a task Mourinho's side will surely struggle to achieve.