It was hard to recall as the final whistle went at Goodison that Chelsea were most people’s favourites for the title just a few weeks ago, before a ball had been kicked. When Roberto Martínez said the 3-1 win had to count as one of Everton’s best because Chelsea won the league by a mile last season it was almost a shock to be reminded.

Now, with the season just five games old, Chelsea have lost three times already, as many defeats as they suffered in the whole of last season. José Mourinho’s champions appear to have undergone a remarkable transformation. Their travelling supporters were only joking when they began to chant “We are staying up”, though gallows humour seems to be in order at the moment. Chelsea were unrecognisable as the team that scored six at Everton last season. Unrecognisable as themselves, unrecognisable as a Mourinho team. They got what they deserved at Goodison, which was precisely nothing. Impressive as Steven Naismith and John Stones both were at the front and back of the team, this was not even an overwhelming Everton performance. Chelsea were just ordinary. Bang average, Harry Redknapp might have said. This did not feel like a shock or a famous Everton victory, it was simply a case of one team playing well and the other team allowing them to do so.

That is not an accusation that could be levelled at many of Mourinho’s teams over the years, but Chelsea’s pressure on the ball was almost nonexistent. Time and again Ross Barkley was allowed all the space he needed to survey his options then pick out a pass. Stones sometimes appeared to be taking on opponents with the ball at his feet just for the fun of it. Chelsea were limp, lethargic. Cesc Fàbregas had no impact on the game whatsoever and it was no surprise he was hauled off before the end, though Eden Hazard was almost as anonymous, Diego Costa ineffective and Pedro a mere shadow of the player everyone knows he can be.

Mourinho’s problems appear to be two-fold. Most obviously there is nothing happening in the engine room, no forward drive, little creativity in the team. It was significant that Chelsea’s only goal came from midfield, and even that might not have happened had Everton realised in time that Nemanja Matic can pack a punch from 30 yards out. At the time it was a goal against the run of play, yet it was not far from the only significant threat Chelsea produced all afternoon.

Mourinho tried to make attacking substitutions but with little effect. While Kenedy did enough to suggest he deserved longer on the pitch, Willian only replicated what had gone before and Radamel Falcao could not manage anything other than a weak header straight at Tim Howard that by Martínez’s reckoning was the only Chelsea attempt on target other than Matic’s goal. “Sometimes when you beat the champions you need lucky breaks or you have to weather the storm,” Martínez said. “This wasn’t like that. We played a very similar game to the one we played last season, and again we scored three goals. The big difference was that Chelsea scored six last season and this time they managed only two attempts on target.”

As good as Everton’s defending was, the suggestion is that Chelsea are not the same attacking force as they used to be. The other worry for Mourinho is that they are not the same defensive unit either. Mourinho mentioned mistakes by his central defenders, though that was slightly unfair. What was most conspicuous by its absence was the collective defending Chelsea used to be so good at, the midfield screen ahead of the back four and the anticipation that used to stifle opposing attack before they had a chance to develop.

Mourinho claims confidence is low because of poor results, but that is a chicken and egg argument. Results have been poor because Chelsea have been playing without their usual drive and self-belief. This is not just a run of bad luck, as the manager is trying to claim. The same players are not performing in the same way as last season.

Some of them are hardly performing at all. Something is amiss, and Arsenal are up next in the league. If Chelsea manage to lose that one, their manager will need to come up with some better excuses.