Jockey Club Racecourses expect revenue losses to exceed initial estimates of £75m.
Frank Lampard says it is important for the Premier League to support EFL clubs financially as some continue to struggle during the coronavirus pandemic.
The RFU is seeking financial aid from the government in response to being unable to host fans at Twickenham in the forthcoming Autumn Nations Cup or Six Nations.
Plans to allow a controlled return of fans into stadiums from October 1 have been paused as the government attempts to tackle a surge in Covid-19 cases.
More than 100 leaders from the physical activity sector have written to Prime Minister Boris Johnson calling for urgent funding during the coronavirus crisis.