According to the Daily Mail, the guard, who no longer works for the company, was caught on CCTV “repeatedly” punching and kicking the man in the head as doormen “looked on”.
The Metropolitan Police said it is aware of video footage which shows a male being “viciously” assaulted outside the hotel, and added that enquiries into the incident from December 2018 have now reopened.
The police are now working to identify the culprit and bring him in for questioning.
A spokesperson for the Savoy said: “On Thursday we became aware of this utterly deplorable incident and immediately launched a comprehensive investigation. To date we have found that the report at the time of the incident neglected any detail of the seriousness of what happened.
“We have reported the incident to the police. The individual concerned is no longer associated with the hotel in any way. We are shocked and appalled by his actions and apologise to the individual and the public for what occurred.”