Ex Chelsea FC Manger, Jose Mourinho will be cross-examined as part of former Chelsea football club's doctor Eva Carneiro's employment tribunal.
Carneiro has claimed constructive dismissal against Chelsea FC, having left the club in September following a row with Mourinho on the opening day of last season.
The doctor and physiotherapist Jon Fearn were withdrawn from first-team action after entering the field to treat Eden Hazard late in the 1-1 draw with Swansea City - infuriating then-Chelsea manager Mourinho as his team was reduced to nine players as a result.
Mourinho said Carneiro and Fearn were "naive and impulsive" and the former did not appear on the bench in subsequent games before departing the club.
The Portuguese manager, who was sacked by Chelsea in December following the club's very poor start to the season, was cleared of using discriminatory language towards Carneiro by the Football Association but still faces a personal legal claim for alleged victimisation and discrimination lodged by the medic.
An insult in Portuguese allegedly used by Mourinho could be central to the case. A short piece of a statement from Mourinho given in court defended his language, with both prosecution and defence poised to call expert witnesses in an attempt to determine exactly what was said.
Carneiro's case began at the London South Employment Tribunal on Monday, with QC Mary O'Rourke confirming that Manchester United manager Mourinho would be cross-examined - as well as Chelsea officials Marina Granovskaia and Bruce Buck.