Steve Holland has said he is staying. I guess that's the end of that then.
http://www.goal.com/en-gb/news/2892/transfer-zone/2014/07/20/4970763/lukaku-set-to-stay-at-chelsea-says-steve-holland?ICID=HP_BN_8
The main reason they have the best finances is because, they have their own stadium as you said. As I said before, come the end of the transfer window if not sooner; 1 if not both of them will be gone.