CCTV image of the man police are seeking to identify (Picture: Met Police).
A manhunt has been launched after a soldier in formal mess uniform was attacked in central London earlier this year.
The 28-year-old was left with a fractured skull, injuries to his face, a fractured cheekbone and eye sockets and a broken nose.
He required extensive surgery following the assault close to Piccadilly Circus.
The attack happened at 3.20am on Thursday 31 January on Haymarket, at the junction with Coventry Street.
Police have now released a CCTV still of a man they are trying to trace.
In the picture, he is bearded with short, dark hair and appears to be wearing a black sweater and blue jeans or trousers.
Anyone who recognises the man should call Westminster CID on 101, quoting Cad 675/31Jan, Tweet @MetCC or call Crimestoppers anonymously on 0800 555111.