Sky News has reported that hundreds of people in Adeje, including British holidaymakers, have been put in quarantine.
A resort – named locally as The H10 Costa Adeje Palace – has reportedly been cordoned off by police, with no one allowed to leave or enter.
Local Spanish newspaper El Pais said an Italian man staying at the resort – reported to be a doctor – was admitted to hospital after testing positive for Covid-19.
It is believed he went to a health centre with flu-like symptoms.
The illness, symptoms of which are fever, cough and shortness of breath, has infected more than 80,000 people around the world.
