"The length of time both have been on the board suggests a lack of focus on board succession planning," ASI said. "Excessive tenure also calls into question an individual's independence and objectivity and our engagement on governance matters suggests that the board is not listening carefully enough to shareholders' views."

ASI, one of Britain's biggest fund managers, currently has a stake of around 0.9 pct in Ryanair.

(Reporting by Elisabeth O'Leary; editing by Stephen Addison)