Chelsea have made seven signings during the transfer window with over £200m spent by Frank Lampard.
But for all the players that have arrived – one man could prove the most pivotal, and many might not even know his name.
The Blues went a year without signings after being hit by a transfer ban.
And Lampard has wasted no time in making up for those two windows with the likes of Kai Havertz, Ben Chilwell and Timo Werner arriving.
The expectations have ramped up at Stamford Bridge and the Blues boss has been touted to challenge for trophies.
But one thing he must improve is his defence – which has been scarily leaky, conceding 54 times last year in the Premier League – the most in the top 10.
It has led to Lampard looking to not just improve his squad but his backroom staff, with Anthony Barry joining from Wigan Athletic.
Despite being just 34, he joins with glowing references and studied for his UEFA Pro Licence in June alongside Lampard and Chelsea's assistant manager Jody Morris.
Barry has been branded a defensive-minded coach but his abilities go much further than that.
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Frank Lampard's team have made wavs by signing Kai Havertz, Timo Werner, Ben Chilwell, Hakim Ziyech, Malang Sarr and Thiago Silva.
And they don't seem keen on slowing down yet. one player who continues to be linked with the Blues is West Ham and England midfielder Declan Rice.
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The former Accrington Stanley star is an avid user of video analysis, going into diligent detail over every facet available.
His relentless commitment to his work will undoubtedly be an absolute asset to Lampard.
Individual errors, set-pieces and poor organisation has cost them goals at the back while going forward, Chelsea could be accused of not utilising their awesome arsenal of talent to their full capacity.
With Barry behind the scenes, the Blues should be achieving that one per cent extra sometimes necessary that can be the difference between winning and losing.
During his time at Wigan, he was also close with Reece James – who has become a key part of Chelsea's XI.
The Englishman starred for the Latics during a loan spell there and knows all about how good the full-back is.
Then there is his enthusiasm, electric personality and popularity among players and staff – which will no doubt make him an infectious member of Chelsea's team.
With Lampard still in the infancy of his managerial career, having a talented squad is one thing – but he will know it will not count for anything without a proper crew of coaches who are willing to put in the graft necessary – and Barry ticks that box.
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