Drawing from the signings that Chelsea has so far made this summer and going by the muttering through the transfer grapevine, it seems that the issue of squad depth and the average age of the squad are certainly being addressed. Didier Drogba, Jose Bosingwa and Salomon Kalou have bid their goodbyes with the club and have been replaced duly by young, vibrant and talented players.
One intriguing thing about his signings this time is their age. Oscar, Marin, Hazard and Thorgan are within the age bracket of 19-23. Trying to build a new era you might want to say which is a good indication of what lies in wait in the future.
My worry is how Di Matteo plans to manage the squad. As it stands, Chelsea has a very large squad of over 34 first team players and according to the Premier League rules, the maximum number of players to be registered is 25 of which 8 must be "home grown" players. Roman seems not be through with his spending, there's talks of a potential move for Maicon, Cavani and Hulk.
Chelsea's Squad list at the moment
Goalkeepers:Cech, Turnbull, Hilario, Blackman
Defenders:Terry, Luiz, Cole Cahill, Betrand, Ferreira, Ivanovic, Van Aanholt, Chalobah, Kane, Hutchinson
Midfielders:Lampard, Essiesn, Mike, Romeu, Meireles, Ramirez, De Bruyne McEachran, Saville
Forwards:Mata, Torres, Hazard, Malouda, Marin, Sturridge, Oscar, Piazon, Benayoun, Kakuta, Thorgan
How The Team Might Look
Anyhow, the formation and tactics RDM plans to employ for the coming season may be something like this. As you can see, there are a lot of options to choose from especially in midfield. Hazard,Oscar, Marin and De Bruyne, the latest signings only add to the numerous midfielders previously at the bridge not forgetting the young guns like Romeu, McEachkran, who will be pushing for a first team shirt.

Satisfying these players will be difficult because they will all want to play and I will say rotating the squad will not really help. Players have to play regularly together for them to gel together.In the end, I think some old players will have to leave to give room for the new ones to blend into the system

Likely Exits
Daniel Sturridge: The young English forward who is representing Great Britain at the ongoing Olympics failed to really impress towards the end of last season and may be allowed to leave. Reports have linked him to Liverpool.
Florent Malouda: The 32-year-old became a free agent at the end of the season following the expiration of his contract with the Champions League winners.While reports have claimed that the Frenchman is considering a move to Brazilian outfit Santos, Di Matteo has suggested that a new contract for Malouda could be likely.
Romelu Lukaku: The young Belgian u has reiterated his desire to leave Chelsea on loan if he fails to secure regular football. The 19 year old has been heavily linked with a temporary switch to Fulham
Others: Gael Kakuta, Raul Meireles
Possible arrivals