Midfield: This is the area of concern for Chelsea. Chelsea have so many midfielders that it is possible to make a playing 11 out of them alone. After Ancelotti's reign, Lampard had been made accustomed to the holding midfield role. Chelsea have Lampard, Ramires, Mikel, Essien and van Ginkel to play in that role. Ramires and Lampard have started at matches against Hull City, Aston Villa, Manchester United and Bayern Munich. At Everton Ramires and Mikel played whereas against Basel, van Ginkel and Lampard did. So there is Lampard, Ramires, van Ginkel, Mikel and Essien (very rarely) who need to work it out with each other to get the rhythm going. Then comes the 3 player behind the attacker. This is where the creativity lies. There are a plethora of options for Chelsea in Eden Hazard, Juan Mata, Willian, Schurrle, Oscar, De Bruyne. De Bruyne-Oscar-Hazard  started against Hull, Mata-Oscar-Hazard start against Aston Villa, De Bruyne-Oscar-Hazard again at Manchester United, Schurrle-Oscar-Hazard against Bayern Munich, Schurrle-Mata-Hazard against Everton and Willian-Oscar-Hazard against Basel. Just look at the different options Mourinho has tried so far. The most creative side of the team was different in all the 6 games played so far.  To find the right combination of players and for players to adopt playing with different system every week will take time. Out of the 6 games played so far, Chelsea have scored 7 goals and 5 of them have come from the midfield position. Chelsea's result throughout the season will hugely depend on these 3 attacking midfield roles. Once Mourinho cracks the puzzle, Chelsea will start getting favourable and most importantly consistent results.