The host of the comedy panel quiz previously revealed that "one regular guest" on the show insists on seeing the questions in advance to allow them to prepare.
After being quizzed by his followers on Twitter, Fry said: "I assure you it isn't Alan Davies who sees the questions in advance..."
Asked if it was Rob Brydon, he replied: "No! Absolutely not!"
There have been a number of guests who have appeared on the show regularly, with Jo Brand, Phill Jupitus, Sean Lock, Bill Bailey, Rich Hall and Jimmy Carr all making more than 15 appearances.