The captain was scheduled to operate a flight from the West African island nation back to the United Kingdom the day after the incident.
According to The Sun, the pilot arrived at the five-star Melia Dunas Beach Resort and Spa on 4 August.
He reportedly engaged in a drinking session at a bar that extended into the early hours of 5 August.
It was at 2.30am that he was “seen stripping off” and proceeded to walk through the reception area before entering the gym and spa, the newspaper claimed.
The Sun did not name the pilot in its reporting.
It claimed that “stunned” easyJet passengers recognised the “paralytic” captain and raised the alarm.
He had been due to operate a flight back to Gatwick approximately 36 hours later, on the afternoon of 6 August, but easyJet confirmed a replacement pilot was found.
Neil Lancefield