Following their elimination from the Champions League last week, Chelsea's season is all-but over with nine Premier League games left to play.
This will come as an unfamilar and displeasing feeling for owner Roman Abramovich who, since tacking over at Stamford Bridge in 2003, hasn't once missed out on Champions League football.
To further compound the Russian's misery, the Blues have officially become the worst title-defending side in English football history after spending much of the campaign in the lower half of the Premier League table.
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Changes and improvements are needed, then. A solid defence was once synonymous with Chelsea during Jose Mourinho's reign, yet they have been poor defensively for much of this season.
As a result, Everton's John Stones is the first name needed in west London this summer. An excellent and young ball-playing defender, the Englishman's age and potential could see him the perfect partner to fellow youngster Kurt Zouma and successor to club legend John Terry.
Elsewhere, Cesc Fabregas, John Obi Mikel and Nemanja Matic as a midfield trio haven't an ounce on Claudio Makelele, Frank Lampard and Michael Essien, whilst Oscar has endured a difficult year.
Chelsea's midfield needs rejuvenating, with Miralem Pjanic one of two midfielders the Blues should pursue. A natural number 10, the Bosnian is a Mesut Ozil-esque player who doesn't excel physically, but technically, with the ability to pick a pass very few others see.
Perhaps above all others, Juventus' Paul Pogba is precisely the big-name signing Abramovich needs to let others know Chelsea mean business.
A man in demand, the Frenchman is a phenomenal player both going forward and defensively and would add all-around quality to the Blues' side.
Going forward, criticism for Chelsea's strikers has seen fans call for Loic Remy and Radamel Falcao to depart and a new forward brought in, especially so given Diego Costa's inconsistency throughout the season.
So why stop at one France international in Pogba when they could go for a double swoop, involving Atletico Madrid's Antoine Griezmann.
The 24-year-old's pace, trickery and finishing have seen him become a fantastic forward and one that would undoubtedly adapt to the Premier League with ease. Even playing him in behind Costa would be a possibility.
Signing all four would be a far-fetched idea, of course, but it's what Chelsea need to force their way back into Europe's elite. The Blues need to splash the cash in the same way that Abramovich did when he first took over.