Although the Blues remain in contention for this season's Premier League title, Chelsea are likely to undergo a period of great renovation this summer.
Jose Mourinho's squad are mixed in alongside Liverpool and Manchester City to win English honours but in order to reach the same dominant levels as the Portuguese's previous reign, some key squad improvements are needed.
Looking at some of those essential areas most likely to see reinforcements, we've compiled a shortlist of those big names very recently linked with the west Londoners, weighing up just how likely it is that a Stamford Bridge switch beckons.
Alberto Moreno, Sevilla
As we edge nearer to the end of the 2013-14 season, Alberto Moreno's star continues to grow and a number of Premier League giants have reason to be looking for left-back replacements.
Arsenal, Manchester United, Liverpool and Manchester City are all reported by the Daily Star (h/t Metro) as being interested in the Sevilla defender's signature, making for what could be an extremely interesting tug of war this summer.
Ashley Cole is set to become a free agent in the summer and The Sun (h/t The Mirror's Chris Richards) quoted a Bernabeu source as saying that Real Madrid are hoping to sign the soon-to-be out-of-contract Englishman:
"Ashley is a world class player and Madrid have wanted to sign him for some time. It is now the perfect opportunity as he is free."
Ryan Bertrand will hope to return to west London from a loan spell at Aston Villa and have some impact at Chelsea, but it's more likely that Mourinho will look to the transfer market in order to plug his left-back slot.
Diego Costa, Atletico Madrid
It's no secret that Diego Costa is one of those names being fervently linked with Chelsea in recent months, following on from a prolific couple of seasons with Atletico Madrid.
As The Mirror's Martin Lipton points out, it's ironic that Costa may be one of those responsible for ending the Blues' Champions League hopes this season after the two clubs were drawn against one another in the competition's semi-finals.
And Mourinho is fully aware of his need for a reliable striking presence, speaking to Canal+ in February (h/t Daily Mail's Matt Lawton and Matt Barlow) in a conversation he was unaware would be broadcasted:
"The problem with Chelsea is I lack a scorer. I have Eto’o but he is 32 years old, maybe 35, who knows?"
Forwards have come to the club with big reputations in the past only to see their reputations diminish upon signing for Chelsea, such as Fernando Torres and Demba Ba. Can Costa be the man who stops that trend?
Mario Mandzukic, Bayern Munich
And in-keeping with Chelsea's apparent need for striking security, Mario Mandzukic is another offensive outlet on the club's radar, with Robert Lewandowski set to complete a free transfer to Bayern Munich this summer and shake up Pep Guardiola's squad.
OptaFranz shows that the two forwards and their prolific form this season give Bayern a conundrum for next term:
John Edwards of the Daily Mail reported in early April that the Croatian's agent had already been in London for talks with the west London outfit, but he went on to quote Bayern chief Karl-Heinz Rummenigge as saying Der FCB are keen to hang on to his services:
We want him to stay, and I remain fairly confident he will. But I know that many clubs throughout Europe want him, and that is not surprising. You only have to look at his scoring record to see his quality, so we will see what happens.
Mandzukic would be the more affordable option at a value of £20 million, per Edwards' report, however, luring his signature from Bayern's clutches could be an impossible task if they're unwilling to part ways.
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