Antonio Rudiger and Andreas Christensen have already left the club to sign for Real Madrid and Barcelona respectively, while Romelu Lukaku returned to Inter Milan on a season-long loan deal.
As well as seeing several players leave, Chelsea have added Raheem Sterling and Kalidou Koulibaly to their squad.
The Blues are also rumoured to be showing an interest in Jules Kounde and Presnel Kimpembe, but while they look to make further additions, there is also the expectation that there will be more departures.
According to the Mirror, Chelsea could still offload 15 players this summer, with Thomas Tuchel looking to streamline his squad before the transfer window closes.
Timo Werner - who previously indicated he could leave this summer - has been linked with a move away, while Emerson Palmieri, Levi Colwill and Baba Rahman are expected to depart the club.
Cesar Azpilicueta and Marcos Alonso continue to be rumoured with a move to Barcelona, and they could be followed out of the exit door by Michy Batshuayi, Ross Barkley and Hakim Ziyech.
After spending last season on-loan at Southampton, Armando Broja could be amongst the Chelsea departures, with West Ham showing an interest in the forward.
Chelsea could also offload Kenedy, Ethan Ampadu and Timoue Bakayoko on a permanent basis, while Tino Anjorin and Billy Gilmour may depart the club on loan.
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