The family-of-four from south Wales successfully sued Cook after suffering vomiting and diarrhoea while staying at the Steigenberger Aqua Magic Hotel in April 2016.
Last month (July), Cook was ordered to pay out £26,000 compensation and costs after the family brought a case with JMW Solicitors.
The case, said JMW, centred around temperature logs and cleaning records which purported to have been signed off by four different people but were found to have been completed by the same person.
John and Susan Cooper fell fatally ill at the hotel last Tuesday (August 21) while holidaying with Cook.
An investigation into their deaths is under way, with forensic teams assessing the food, water and air conditioning at the hotel.
Cook boss Peter Fankhauser flew out to Egypt on Wednesday (August 29) to meet with the Egyptian prime minister and tourism minister, calling for swift action on the probe.
They have collectively promised a full, thorough and transparent investigation into hygiene standards at the hotel.
The Egyptian authorities have said the couple died of natural causes. Cook has said there is no evidence to suggest the couple died of carbon monoxide poisoning.
Cook pulled all 300 of its guests out of the hotel, offering them alternative accommodation or flights home.
Fankhauser has confirmed 13 guests at the hotel are understood to have been suffering food poisoning when Mr and Mrs Cooper, a Thomas Cook agent in Burnley, died.
