Chelsea have been using two formations during their pre-season; 4-3-3, and 4-2-3-1.
With the 4-2-3-1 system having been used at Chelsea for the past two seasons, it seems unlikely that Mourinho will upset the flow by scrapping this and introducing a formation that would see Chelsea's best player, Juan Mata, played in his un-favoured position at left wing.
With the 4-2-3-1 formation set up to revolve around Mata, as the main creative talent, and with the pace and skill of Oscar and Hazard playing as the wide attacking players, this would seem the most likely formation to suit Chelsea.
In his first spell at Chelsea, Mourinho preferred the 4-3-3 formation, using Arjen Robben and Damien Duff as the wide men, and deploying either Eidur Gudjohnsen or Didier Drogba as the main striker. This approach gave Frank Lampard the freedom to be the main box-to-box midfielder, given as he knew that he was being partnered by possibly the best-defensive midfielder of all time, Claude Makelele.
However, this formation will not be as effective for the Portuguese boss' second stint in charge, as Chelsea lack a world-class defensive-midfielder and rely so heavily on Juan Mata that through changing the system, and deploying Mata as a wide player, they could limit Chelsea's attacking options, having to resort to playing the important players, namely Hazard, and the aforementioned Juan Mata, in less effective roles.
It remains to be seen whether Mourinho will rely on Fernando Torres and Demba Ba up-top this season, or opt for the younger Romelu Lukaku, who is the closest resemblance to the star asset of his first spell in charge, Didier Drogba.
Lukaku's pre season form for Chelsea certainly warrants him a place in the starting line up, but Jose's unrelenting pursuit of Wayne Rooney does raise questions as to who will be used as the main focal point of Chelsea's attack this season.
It should be highlighted though, that Mourinho has a history of alternating strikers. Karim Benzema and Gonzalo Higuain were regularly switched around at Madrid, Samuel Eto'o and Diego Milito took turns at Inter, and Gudjohnsen and Drogba regularly alternated at Chelsea.
I think that all of this depends on Chelsea's activity in the transfer market, and whether Mourinho chooses to stick with the striking and defensive options that he already has, or chooses to stamp his authority on the team by signing a player who could fire them to the title, like he did last time around with Drogba.
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