Chelsea team doctor Eva Carneiro has decided to leave after she was publicly criticised by manager Jose Mourinho.
Carneiro, 42, had her role downgraded following a row during the 2-2 draw against Swansea on 8 August.
Chelsea asked her to return to work, but she has decided not to and is now considering her legal position.
The Football Association is looking into a complaint that Mourinho used abusive or sexist language towards her.