Police are renewing their appeal to find Valentin Kachanov, who has been reported missing from West Thurrock.
No-one has heard from the 27-year-old since he called his mother, who lives in Bulgaria, at about 7.40pm on Friday 8 February.
Earlier that day he had left his home address at around 7am to go to the Tesco Extra at Lakeside retail park and then later went to intu Lakeside shopping centre for 10am.
He withdrew some money from a HSBC cashpoint and may have used the Coral betting shop in the centre.
His movements after this are unclear, he may have returned to his home nearby, or may have travelled into Grays.
Detective Superintendent Simon Anslow said: “Valentin regularly spoke to his family back in Bulgaria over the phone and for them not to have heard from him for this length of time is really unusual.
“Often when someone goes missing there is something in their background that indicates why. But at this stage of our investigation we have not been able to identify that with Valentin.
“We’ve not been able to identify that he has any debts, drink or drug problems, mental health concerns, or connections with people involved in crime.
“We have no information to indicate he’s come to any harm but we are keeping an open mind and really need your help to locate him.
“Valentin’s family are understandably really worried about him and we’re very concerned too so we need to find him to make sure he’s okay.”
If you’ve seen or know Valentin, or have any information about where he is please call us.
Police are also interested to speak to anyone with dash cam footage who travelled along London Road, West Thurrock or West Thurrock Way on Friday 8 February in order to help our enquiries.
Contact police on 101 or crimestoppers.