The third-placed Blues topped the Premier League table as recently as last month.
From Granero to Mustafi, we pick the worst Prem transfer from each of the last 20 windows...
“I am very happy in general. Happy is maybe not the right word, but I am super impressed with Kepa."
With players leaving for AFCON, out of favour stars can emerge as a starting option. Here are five examples.
"I tried to have open conversations with him and it got to the point where it felt like I just had to make a change."
"I will be ready but we have a lot of games until we start thinking about that."
Chelsea boss Tuchel has attempted to take the heat off one of his players by saying their price tag doesn't matter.
The importance of a solid No.2 should not be understated but most Premier League clubs look way short.
Kepa wins the Super Cup for Chelsea as Tuchel trusts the data.
"We talked about it with the goalkeepers after the first cup game against Barnsley. We were prepared."
It turns out that it is quite difficult to get your point across during extra-time of a cup final.
Chelsea are ready to offer Tottenham two players in exchange for Kane, with a third a possibility.
"But the way the guys handled the situation, that was impressive and showed a lot of courage."
Thomas Tuchel was forced to send Antonio Rudiger to the changing rooms early after a fight with Kepa Arrizabalaga.
"I have to say that he looked well short of what a top goalkeeper would be last time we saw him."
Tuchel has confirmed that Kepa will start against Barnsley on Thursday in a "new start" at Chelsea.
Many of this lot had good options to move on but they all remain stuck where they are until at least the summer..
Declan Rice has been a long rumoured target for Chelsea and Frank Lampard...
Frank Lampard insists he is under no pressure to sell out-of-favour Chelsea goalkeeper Kepa Arrizabalaga.
Alisson is supposed to be the best of the bunch but he's not even mid-table on this list.
Chelsea bosses are interested in loaning out Kepa following his poor start to the season and the arrival of Mendy.
The west Londoners have shipped 63 goals in boss Lampard’s 43 matches at the Stamford Bridge helm.
Kepa Arrizabalaga has vowed to fight for his Chelsea future after losing his place to new recruit Edouard Mendy.
The £72million man Kepa and veteran Willy Caballero will battle it out to start at The Hawthorns on Saturday.
The report believes that 'Mendy’s arrival effectively spells curtains for Kepa'...
Goalkeepers don't do well under Frank Lampard. Can Mendy break the curse?
Kind words for Wilfried Zaha and Liverpool but Lampard and Solskjaer get a shoeing...
"Sadio Mane's goals on Sunday meant he had conceded 11 of the last 16 shots he's faced."
"I thought Kepa got away with it with the red card. He should not have been out there."
Chelsea manager Frank Lampard still supports Arrizabalaga despite him making a big mistake against Liverpool.