The film festival has said it backs Gilliam and is proceeding as planned with the premiere, unless the court hearing rules otherwise.
The same day, a court hearing was held in Paris to rule whether Gilliam’s new film, The Man Who Killed Don Quixote, can close the Cannes film festival on 19 May.
Terry Gilliam, the former Monty Python member and director of films such as Brazil and Time Bandits, has suffered a minor stroke.
He is said to be recovering well in London after falling ill over the weekend, returning home from hospital on the evening of 8 May.