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Could be anything, this one. Manchester United go to west London on the back of perhaps their best performance of the season so far, a 3-0 gubbing of Stoke City that had style, panache, and an absolutely gorgeous counter-attacking goal. That game made it six goals in two games, and confidence, you'd imagine, is high.
However, Stoke were appalling. Chelsea, for all that they're in 13th place, and for all that their title defence is little more than a smouldering pile of ashes and regret, are going to be a stiffer test today. They haven't lost since Guus Hiddink came in to do his interim thing, and while they haven't exactly been good, they certainly haven't been bad either.
We've a full preview here, but the most notable injury news is that Phil Jones might be back! Hooray! Also, do have a look at our interview with a Chelsea fan, and today's rumours.
HOW TO WATCH
When: Sunday 7 February, 4pm UK time, 11 am ET
Where: Stamford Bridge, London
Television: Sky Sports One in the UK, NBC Sports in the USA
Online streaming: SkyGo will sort you out in the UK, and over in the States,
Lineups to follow ...