Ekitike was injured in last night's match between Liverpool and PSG in the Champions League.
According to initial estimates, the French footballer will not be able to play for between six and nine months.
Ekitike has finished the season, but due to injury he will not be at the World Cup, which is being held this summer in the USA, Canada and Mexico.
France is in a group at the World Cup with Senegal, Iraq and Norway.