The 42yr old doctor was dropped from first-team duties after Mourinho criticized her and first-team physio Jon Fearn for going onto the pitch to treat Eden Hazard on the opening day of the season.
Carneiro did not appear on the bench again for first-team duties and later parted company with the club.
Mourinho was cleared of using discriminatory language towards her following an investigation by the Football Association. Afterwards, Carneiro and the FA's independent board member Dame Heather Rabbatts criticized the governing body for not interviewing the doctor as part of its investigation.
Yet he could be told to pay Carneiro hundreds of thousands of pounds if she wins her case, and the club failed to indemnify Mourinho as part of his compensation package.
Carneiro has also had backing from FIFA's medical chairman Michel D'Hooghe, who contacted the doctor to offer his support and that of the world governing body. He has backed Carneiro's insistence that she was simply doing her job.