Chelsea have already started working on the transfer market as David Datro Fofana will officially be a Blues player from January 1.His move from Norwegian club Molde FK is complete.Andrey Santos will fly to London on Thursday to finalize his transfer from Vasco da Gama.The two clubs have agreed on a fee of €12 million. Fofana has scored 17 goals and has provided six assists in 29 games so far this campaign. The 20-year-old could walk straight into Graham Potter's starting lineup.Fabrizio Romano@FabrizioRomanoOfficial: Chelsea have completed the signing of Ivorian striker David Datro Fofana from Molde on €12m fee, here we go confirmed. 🤝🏻 #CFCLong term deal signed, medical done and full agreement in place for deal completed by the agent Atta Aneke.235662676Official: Chelsea have completed the signing of Ivorian striker David Datro Fofana from Molde on €12m fee, here we go confirmed. 🔵🤝🏻 #CFCLong term deal signed, medical done and full agreement in place for deal completed by the agent Atta Aneke. https://t.co/eIboNLHFfUArmando Broja has been ruled out for the remainder of the season after sustaining an injury against Aston Villa during a friendly.Potter is yet to be sold on Pierre-Emerick Aubameyang and used Kai Havertz through the middle against Bournemouth. The German scored one and set up another during the game. Fofana's arrival will give Potter more options to work with.Andrey Santos, meanwhile, will fly to London later this week. A €17.5 million fee has been agreed upon for the player with Vasco da Gama. The Blues are hoping to get a work permit for Santos before he joins the squad. He could very well be loaned back to Vasco da Gama for the remainder of the season.Venê Casagrande@venecasagrandeAndrey Santos deve viajar nesta quinta para realizar exames médicos no Chelsea. O volante foi vendido pelo Vasco por 12,5 milhões de euros. Tudo assinado entre os clubes. Caso ele não consiga o visto para atuar no primeiro semestre fica emprestado ao Vasco até o meio de 2023.99671Andrey Santos deve viajar nesta quinta para realizar exames médicos no Chelsea. O volante foi vendido pelo Vasco por 12,5 milhões de euros. Tudo assinado entre os clubes. Caso ele não consiga o visto para atuar no primeiro semestre fica emprestado ao Vasco até o meio de 2023.Apart from the duo, the Blues have been heavily linked with a move for AS Monaco star Benoit Badiashile. Potter, however, refused to comment on the under-21 France international, as he recently said (via Metro):"My answer is I don’t speak about anyone that isn’t a Chelsea player, ‘I always say the club’s responsibility is to try to improve the team but my job is to try to improve the players we have here, and the team. That’s what I’ll be focused on."Chelsea target Enzo Fernandez broke silence on futureArgentina v France: Final - FIFA World Cup Qatar 2022Enzo Fernandez has emerged as a target for top European clubs, including Chelsea. The Benfica starlet, however, is solely focused on his current club. He recently told a crowd of fans (via Football.London):“I don't know anything about that. It's up to my agent, I don't want to get involved. I'm focused on Benfica, in a few days we have an important game. I have a flight at night to play in the game on Friday."