Police are looking for two men who allegedly attacked a 19-year-old man and his friend outside the Lincoln Tesco on Wragby Road.
The 19-year-old sustained minor facial injuries and his mobile phone was stolen.
The victim was out in Lincoln on Tuesday, September 2, with a group of friends. In the evening, they met two men who they befriended.
Together, they went to the Tesco superstore on Wragby Road.
It was after they left the shop, on waste ground at the back of the store, that the two men became violent and attacked the victim and one of his friends.
The victim sustained a bloody nose and facial bruising and his mobile phone was stolen.
Police are appealing to trace and talk to two men, who are both believed to be Eastern European.
One is described as around 5ft 7in tall, with short blonde hair, of average build, and wearing a light blue hooded top which had white writing across the entire chest, and dark blue jeans.
The second man is thought to have been around 5ft 10in tall, with dark spikey hair, of slim build and wearing a black waterproof jacket and dark jeans.
Anyone who may know these men, or the men pictured, is asked to contact Lincolnshire Police on 101 quoting incident 38 of September 3.
Alternatively, people can contact the independent charity Crimestoppers anonymously on 0800 555 111.