Gordon Ramsay is facing claims that a Muslim worker at his eponymous restaurant in Chelsea was the victim of racist abuse by staff.
Kitchen porter Tama Siby claims he was called a "black donkey" by a staff member and victimised because of his religion, according to the Sunday Mirror.
He is taking Gordon Ramsay Holdings to tribunal, demanding more than £50,000 for unfair dismissal from the restaurant.
Siby alleges racial harassment, racial discrimination, religious discrimination and victimisation. Ramsay himself has not been implicated.
After hearing the claims, Claire Lynn, the head of human resources for Gordon Ramsay Holdings, called a meeting of senior managers, the Sunday Mirror said.
She told them of the issues raised by Siby - and warned that if there was any offensive kitchen banter it had to stop.
The employment tribunal claim will be heard at the London Central Employment Tribunal.
By Daniel Thomas