A 58-year-old man was treated in hospital after he was attacked as he walked toward a taxi rank.
The man was attacked from behind and then punched in the face in George Street, Hinckley, in the early hours of last Sunday. (3 April)
Police said the attack happened between 4am and 4.20am.
The force of the punch caused the man to fall to the ground. He was taken to hospital where he was treated for an injury to his head.
In a statement, Leicestershire Police said: "We believe there were a number of people in the area at the time and would like to speak to anyone who thinks they could have information."
The suspect is white, of average build, 5ft 10ins and was wearing a blue and cream red check shirt and jeans.
He walked from the scene with a woman who was wearing a blue dress.
Contact Pc Paul Hicks on 101 or Crimestoppers, which is anonymous, on 0800 555 111.
