A court has been told Rory McIlroy deliberately wiped clean up to eight electronic devices that may have contained important data relating to his legal action against his former management firm.
Their lawyers said the "factory resetting" was also done to the devices of three other key figures in the case including his father Gerry.
They described this as "incredible".
Horizon Sports Management wants orders from court for further disclosure.
These include for documents and the inspection of electronic devices.