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Michele Ann Joy Bourda, 59, had been swimming at Ofrynio beach in the city of Kavala at around noon on Friday before disappearing.
www.dailymail.co.uk
A sports instructor has now claimed that he saw a woman that resembled Mrs Bourda swimming in deep waters and said that he urged her to not go any further, LBC reports.
Sources have also claimed that her belongings were left behind next to her sun-lounger after she vanished.
A Silver Alert was issued after the police failed to immediately locate the tourist and authorities have warned that she may be in danger.
A source close to the investigation told
The Sun: 'We are giving it our all. There are still no signs as to whether she went missing on land or sea but right now there are no plans either to end this search.'