The disappearance of rugby player Levi Davis is being investigated by Spanish detectives in order to understand whether or not a crime has been committed, the BBC reported.
He was last seen in a pub in Barcelona, Spain on 29 October.
Officers have since described the case as “disturbing” due to there being “no logical explanation” about what happened.
The 24-year-old had gone to Ibiza a few weeks before going missing to stay with his friend Richard Squire and work on some songs together.
Squire said he last saw Davis on 28 October when he was dropped off in Ibiza Town.
Davis then travelled to Barcelona and can be seen on CCTV leaving the Old Irish Pub the following day – though he has not been seen since and his passport was found by police a few weeks later.
He was carrying a small black backpack and wearing a white T-shirt, black jeans and white trainers at the time of his disappearance.
In a voice note sent to a friend just before midnight on 30 October, Davis said Barcelona is “absolutely beautiful” and is helping him get inspired.
His family has since shared that he was in a “sad place” and has struggled with his mental health in the past.
Loved ones are now running a social media campaign to try and find him, with a £10,000 reward offered in exchange for information leading to him being found.