It's something that's become more than just a coincidence at all of his previous clubs that it now just seems like something of a necessity: Jose Mourinho does not like big squads.
The evidence lies with the fact that Chelsea have already loaned out over 20 players for the new season, with many still yet to find a suitable destination.
Obviously, Mourinho authorised the departures of out-of-favour duo Florent Malouda and Yossi Benayoun, as well as releasing reserve goalkeeper Ross Turnbull. But the only sale to date has been Jeffrey Bruma, who returned to his native Holland with PSV Eindhoven for £2.5 million.
And so, we came to the conclusion that some more players could find themselves in danger of being shown the door at Stamford Bridge.
Come with us to find out who they are.
Having joined the club in controversial circumstances in 2006, John Obi Mikel is one of Chelsea's longest-serving arrivals.
And to be signed by Jose Mourinho, who has now returned for a second stint at the club, one could assume his place is not under threat. But his future is far from certain.
The fact that Mikel has barely featured for the club since May should not alarm any supporter, as the Nigerian midfielder has been away with his country on international duty, with an extended break after the Confederations Cup.
And while the 26-year-old moved to quash speculation of his departure, per The Independent, the signing of Marco van Ginkel has increased the chances of the former Lyn Oslo man leaving Stamford Bridge.
That said, Mourinho is not the type to look to sell his players, and should a deal fail to arise for Mikel, the West London club would be more than happy to keep him as a back-up option.
After smashing in 29 Premier League goals in just 54 games for Newcastle, Demba Ba was hot property, and after drawn out negotiations, Chelsea sealed a £7 million deal in January this year.
The Senegalese striker was tipped to make a lasting impression at Stamford Bridge, filling the void left by Didier Drogba and adding some much-needed firepower to the squad.
But just two Premier League goals followed, with six in all competitions, and despite glimpses of his form at Newcastle, it appears that Ba's career with the Blues could be short-lived.
With Romelu Lukaku returning and Fernando Torres finding form, the 28-year-old could find himself down the pecking order this season. And reports in The Mirror suggest that West Ham are interested in taking him back to Upton Park, where he spent the 2010-11 season before joining Newcastle.
Add into the mix Jose Mourinho's publicised pursuit of Wayne Rooney and it spells trouble for the former Hoffenheim man, although a decent start to the Premier League season would certainly improve his chances of staying.
There were, and still are, high hopes that Gary Cahill can improve and become a leading figure for both club and country.
A real old-fashioned defender, Cahill loves a 50/50 tackle or a typical aerial duel with a towering striker, mainly because he usually comes off best.
But his lack of consistency is really starting to affect his game, and perhaps, put his future on both club and international level in doubt.
He started against Scotland the other night and after a solid start, showed why he is not considered a regular in the Chelsea lineup, turned easily by veteran striker Kenny Miller.
A similar style of defender to captain John Terry, the 27-year-old knows there is only room for one of them under Jose Mourinho. In addition, the Portuguese coach now has Tomas Kalas and Kenneth Omeruo as potential deputies should Terry get injured.
Consequently, Cahill has a lot to prove at Chelsea and if he fails to impress, a switch could definitely be on the cards come the end of August.
You get the feeling that the 2013-14 season could be the biggest turning point in Ryan Bertrand's career after a swift change in fortunes for the former Gillingham trainee.
After being named as a shock starter in the Champions League final, Bertrand has enhanced his reputation, representing Great Britain at the Olympics and making his first appearance for the England national team.
But there is one problem, which is ultimately stunting his development as well as helping him: Ashley Cole. While the 32-year-old left-back is giving Bertrand some invaluable lessons on how to succeed, Bertrand is not a youngster anymore at 24 and needs to play regularly.
On the other hand, after seven years at the club, Bertrand may feel the need to leave in pursuit of regular first-team football if he cannot usurp Cole at left-back.