Hakim Ziyech was the first deal as his €40m (£33.4m) move from Ajax – which could potentially increase to a maximum of €44m – was agreed shortly after the January transfer window closed.
He was then joined by Timo Werner as the Blues won the race ahead of Liverpool and Manchester United by triggering the £47.5m release clause in his contract at RB Leipzig.
Then came three defensive signings is as many days towards the end of last month.
Ben Chilwell completed his £50m move from Leicester City, while Malang Sarr and Thiago Silva both arrived from Ligue 1 on free transfers after leaving Nice and Paris Saint-Germain respectively.
The sixth new signing – but certainly not the final piece of business from the Blues – was Kai Havertz as his club-record £72m (which could rise to £92m) transfer from Bayer Leverkusen was finally announced last Friday.
However, none of the aforementioned players had been allocated shirt numbers at their respective unveilings.
And it remained the case until four days Blues’ Premier League opener against Brighton and Hove Albion as the squad numbers for the new season have now been confirmed.
Ziyech will wear no.22, Werner has been given no.11, Chilwell has taken the no.21 and Thiago Silva is Chelsea’s new no.6.
Other changes include Havertz taking the no.29 after Fikayo Tomori agreed to move to no.14 and Christian Pulisic has inherited the no.10 following Willian’s move to Arsenal.
Sarr hasn’t been allocated a shirt number as he is expected to be loaned out.
In confirming the new shirt numbers, Chelsea have dropped a major transfer hint regarding at least three players who have been left without a squad number.
Tiemoue Bakayoko’s no.14 has been taken and football.london understands he is still expected to join AC Milan on loan with an option to buy.
The same applies to Chelsea’s former no.21 Davide Zappacosta as he is expected to return to Italy amid links to Atalanta.
Meanwhile, Danny Drinkwater – who used to be in possession of the no.6 is free to leave this summer after being informed he won’t be part of the first-team squad this season.
However, football.london understands he is struggling or suitors, and if he reports for training, it will be the Development Squad.
With that said, what shirt numbers are now available to any more signings?
We take a look…
No.16 could be a potential option for a new signing with Kenedy out on loan once again.
Although the No.25 shirt has not been officially retired by the club, it seems that Chelsea do not want anyone to take on Gianfranco Zola’s famous number.
Departing for his home country back in 2003, nobody at the club has worn the shirt since the Italian maestro departed over a decade ago.
As is the case with the No.25 shirt, John Terry’s No.26 may well be left vacant following his trophy-laden spell at Stamford Bridge.
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Andreas Christensen’s move to the no.4 has left the no.27 vacant.
This became vacant when David Luiz joined Arsenal in the summer.
It’s a squad number that has been worn by the likes of Yossi Benayoun, Tiago and Jesper Gronjkaer in the past.
The No.32 shirt has been vacant following Marco Amelia’s departure in 2016.
Andreas Christensen, the club’s current No.4, had worn the number during the 2012/13 season.