Former Chelsea team doctor Eva Carneiro will make an individual legal claim against the club's manager Jose Mourinho.
She is already taking action against the club for constructive dismissal.
But this second move means that Mourinho will have to appear at an employment tribunal if the case is not settled out of court.
The Blues boss criticised his medical staff for running onto the pitch to treat Eden Hazard on the opening day of the season, when Chelsea were held to a 2-2 draw by Swansea.
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