Saturday's lacklustre performance against a defiant Crystal Palace side highlighted the monumental task Chelsea face to retain their Premier League crown, and stressed their dire need for defensive reinforcements.
The need for a new centre-back is blatant, but that alone will not be sufficient. Chelsea should also seek to recruit a new central midfielder to provide further protection for their currently porous back four.
There is no doubt that Nemanja Matic and Cesc Fabregas are a formidable midfield pairing, but they have failed to reproduce the sparkling form that earned them panegyric praise from their manager and the media alike and formed the foundation of the Blues' Premier League triumph.
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The reality is that they, as with the majority of the squad (Eden Hazard and Cesar Azpilicueta aside) have not looked at their best since January last year.
Whether it be as a result of tiredness due to Mourinho's reluctance to rotate, or complacency for the very same reason, or another reason, the side failed to look quite as imperious as the season wore on.
And so now Chelsea are left with a side struggling for fluency, but with few alternatives to help spark a change.
Matic and Fabregas are virtually untouchable, not due to their own brilliance, but due to a shortage of options. Mourinho simply must change this.
There must be some stronger competition for Matic, which may help to boost his performances. It would also enable Mourinho to push Fabregas forward into the number 10 role, where his defensive responsibilities will be reduced, allowing him to focus on his role as the team's playmaker.
Ramires and John Obi Mikel are decent squad players, but do not possess sufficient quality to be part of an all-conquering midfield duo.
Ruben Loftus-Cheek looks promising, and I would love to see the youngster clock up more minutes, but Mourinho seems reticent despite all his talk of bringing through more youth team players.
His row with Loftus-Cheek in Australia over the summer seemed to be a way of justifying his lack of game time.
And so we come to Paul Pogba. An excellent player, somebody who would undoubtedly improve the Chelsea midfield. Superb technically with an imposing frame, he offers Chelsea a threatening attacking outlet who can still contribute defensively with more success than Fabregas. It seems like a no-brainer.
And yet I would be reluctant to see the club sign the Frenchman from Juventus. The Italian giants are reportedly asking for an eye watering sum of money for the youngster, with a further £250,000 a week to be committed in wages.
As good as Pogba is, I can't see the justification for spending that kind of money. He is young and will improve, but I don't see him being able to single-handedly transform the team's fortunes which, let's be honest, you would expect for that eye-watering sum.
Indeed, he was virtually absent when it really mattered, in the Champions League final against Barcelona.
The pressure it would put the player under would be immense, and for somebody so young it could be potentially damaging. He would be expected to excel week in, week out by the fans and his manager, something I fear he would be unable to do.
Besides, Juventus have already lost Arturo Vidal and Andrea Pirlo this summer and so will demand top dollar for Pogba. Wait a year and maybe the asking price will drop to a more reasonable sum.
Surely there must be a better option out there? Julian Draxler? Blaise Matuidi? Marco Veratti?
Or maybe I'm just out of touch in believing that this fee is excessive and that there must be a better option out there. After all, Manchester City paid £58million for Kevin De Bruyne...