Greg Monks was last seen after leaving the main strip in Albufeira in the Algarve region after a night out between the evening of May 27 and the early hours of May 28.
The 38-year-old had arrived in the resort town on Tuesday, May 27, for a stag do and has not been seen now for four days.
Jillian Monks, Greg’s sister, posted an updated plea on Facebook last night.
The family is appealing for home camera or doorbell footage from the Cerro de Aguia area between 2am and 5am on May 28.
Jillian noted that police believe Greg was in this area around this time.
The post reads: “Hi all, thank you for all the information and shares, we truly appreciate it. There have still been no sightings and no updates at present.
“I am now seeking help from the residents of the Cerro de Aguia area to please check any home cameras or doorbell footage from between 2am and 5am, as police believe he was in the area around this time.
“Please share this if you know anyone in the area. Anyone who has cameras that cover streets or parts of streets, please send me a message.
“Thank you all for the support.”
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Members of Greg’s family have flown out to Portugal to help search for him.
We previously reported that a family friend had set up a GoFundMe page to support them.
It has so far raised more than £14,000.
A statement published on the page reads: “I have been asked by the family to set this up. Our son Greg Monks, 38, went to Portugal for a stag do on Tuesday, May 27.
“On their first night out, our son Greg never returned to his hotel and has now been reported missing for three days.
“We are desperately seeking Greg’s safe return and need your help. There are professional search teams out looking for Greg, and the family have all flown out to try and help find him, but they don’t know how long their stay will be.
“They are doing everything they can. Every donation, no matter the size, will make a difference in our efforts to bring Greg home.
“Thank you for your support and prayers.”
Greg’s family say his disappearance has been reported to the police, the hotel where he was staying, and the British Embassy in Portugal.
A spokesperson for the Foreign, Commonwealth & Development Office previously said: “We are supporting the family of a British man reported missing in Portugal and are in contact with the local authorities”.
The GoFundMe page can be viewed HERE.
