[Getty Images]Manchester City have opened talks with Chelsea in their bid to sign midfielder Enzo Fernandez.In what is set to be one of the key narratives on transfer deadline day, City have set the wheels in motion towards what would be one of the most expensive deals of the summer.It is understood Chelsea want a minimum of £120m for Fernandez and talks are under way as both clubs negotiate a price.Fernandez, 25, worked with City manager Enzo Maresca during the Italian's reign at Chelsea.