The Ghanaian has made just two Premier League appearances since the turn of the year and the Blues boss says he would consider letting the midfielder leave the clubChelsea manager Jose Mourinho has hinted that midfielder Michael Essien could leave the club.
Goal exclusively revealed on Thursday that the Ghana international, who has made just nine appearances for Chelsea this term, is in talks with a January move to AC Milan.
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"Michael Essien is at this moment in a position where he can go or he can stay," Mourinho told reporters.
"If he stays we are more than happy, he is a fantastic club man, but he is another player that gave everything to this club and if something big comes to him, he is another we feel we must show him the respect.
"If he stays, he stays and if he stays he is playing against Stoke next weekend. A player we are more than happy if he stays."
Milan have endured a disappointing season so far and sit 11th in Serie A, but their squad has been bolstered by the signings of attacking midfielder Keisuke Honda and defender Adil Rami.
Former Netherlands international Clarence Seedorf replaced Massimiliano Allegri as Milan coach earlier this month, beginning his tenure with a 1-0 win over Verona, before suffering a 2-1 defeat to Udinese in the Coppa Italia.