Essien was back in London last week.
Mourinho explained: "You're calling us liars and I think that that is what you are. We know that Essien has had an allergic reaction, and has been treated for the pain he had and his club, which is Chelsea, were interested in knowing how he is and so he went there to be treated. We are not liars. He will return to Madrid tomorrow and on Sunday he will be in training as normal."