The Sun – Cops found Mussie Imnetu, 41, unconscious with a head injury in Queensway, West London, at 11.22pm on Monday.
They provided emergency first aid until paramedics arrived and Mussie is now critically ill in hospital.
The Swedish national was visiting the UK on business from Dubai where he lived and worked as a chef.
He left The Arts Club on Dover Street shortly after 1pm on Monday.
The Metropolitan Police said he was alone, wearing a blue t-shirt and black jeans, and later bought a white baseball cap.
He arrived at Dr Power restaurant in Queensway at around 10.30pm and was still alone, the force added.
The restaurant was serving food from stalls outside and playing music.
The venue and surrounding area were extremely busy with people who had been to Carnival.
Mussie’s family is being supported by specialist officers.
Police arrested a 31-year-old man at an address in Newham on suspicion of attempted murder in the early hours of Wednesday morning.
He remains in custody at a South London police station.
Detective Chief Inspector Brian Howie, leading the investigation from the Met’s Homicide Command, said: “While the arrest of a suspect is a significant step in our investigation, we are still very keen to hear from anyone who can help piece together Mussie’s movements between when he left The Arts Club at 13:00hrs and when he arrived at Dr Power restaurant at 22:30hrs.
“If you visited the restaurant between 22:00hrs and 23:30hrs on Monday night or were in the area and saw something, regardless of the reason you were there, please do get in touch.
