Chelsea are said to be ready to sign Frenkie de Jong and Aubameyang both now. However it depends on whether Barcelona are thinking of letting them go now. Actually Barcelona are in a troubling situation when it comes to the La Liga. They will need to cut the total salary of the players somehow otherwise they might face a problem like they wouldn't be able to register some players as you know. So I wonder if they will go for selling at least one of these two players to relieve a little.
Given the current state of affairs between Barcelona and Frenkie De Jong, I don't think there would be an amicable resolution of the scores between both parties, and Eurosport claimed Barcelona have handed De Jong a transfer ultimatum, with Chelsea appearing to be the most likely destination of the midfielder subject to agreeing personal terms with the club.
Barcelona have also reiterated that they'd only be selling one of Memphis Depay and Aubameyang, with a deal for Depay from Juventus being on the radar, I strongly doubt that both De Jong and Aubameyang would be leaving for Chelsea, more likely only De Jong would in this case.