New Cheltenham racecourse chairman Martin St Quinton has refused to rule out the possibility of adding a fifth day to the Festival meeting in the future.
St Quinton, who has owned top-class horses such as Coulton and Monkerhostin, succeeded Robert Waley-Cohen at the end of the 2018-19 jumps season.
Speaking to ITV Racing, he said: "We're very happy with our four-day Festival at the moment, but we're always keen to look at ways of innovating and improving things and widening the appeal of racing.
"I wouldn't rule anything in, but I wouldn't rule anything out.
"It would get a lot of opposition, but people don't like change. People complained when it went from three days to four, but now everybody loves the four-day Festival.
"Royal Ascot was very similar with the Heath meeting on the Saturday and now that is their most popular day, so you've got to be open-minded about these things."
St Quinton added a decision on which race the new mares' chase will replace in 2021 will be taken after a review of this year's Festival.