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One thing we have looked at in the past, and are looking at again, is the possibility of maybe putting a coin slot on the toilet door, so that people might actually have to spend a pound to spend a penny in future," he told the BBC.
He added: "I don't think there is anybody in history that has got on board a Ryanair aircraft with less than a pound."
But Rochelle Turner, head of research at Which? Holiday, said: "It seems Ryanair is prepared to plumb any depth to make a fast buck and, once again, is putting profit before the comfort of its customers.
"Charging people to go to the toilet might result in fewer people buying overpriced drinks on board, though - that would serve Ryanair right."