Signing new contract according to Sky
https://www.skysports.com/football/live-blog/11095/12476234/transfer-centre-live-how-will-new-chelsea-act-in-market-as-todd-boehlys-4-25bn-takeover-nears-completion?postid=3944064#liveblog-body
That would be because he doesn't play for them any longer.
https://www.skysports.com/football/news/11095/12587739/pierre-emerick-aubameyang-on-target-again-as-barcelona-sink-levante-late-on-european-round-up