Tuesday, according to this - http://www.theguardian.com/football/2015/jul/19/radamel-falcao-prove-critics-wrong-mourinho (second paragraph). Guessing the same goes for Willian, Luis and Cuadrado as well.
Everton had already told Chelsea John Stones was off-limits before £20m bid Sounds like Stones may have to force the issue for this transfer to happen...
Rumours suggesting Chicago Fire and Montreal Impact are the two clubs looking to sign him - http://www.mlssoccer.com/news/article/2015/07/19/transfer-watch-didier-drogba-reportedly-talks-join-mls-chicago-fire-and-mont
http://www.skysports.com/football/news/11661/9918432/ex-chelsea-forward-didier-drogba-reveals-he-is-in-talks-to-join-mls-side?utm_source=twitterfeed&utm_medium=twitter Drogba has confirmed that he is in talks to sign for an MLS club.