The man is described as white, brown hair, around 28 years old and of slim to medium build. He was wearing a black leather jacket, blue jeans and dark trainers.
A statement from police said: “Police Scotland is investigating a serious assault that occurred on Bell Street near Distrikt nightclub on June 29 at around 3am. The incident left two men injured and one requiring hospital treatment.
“Officers are keen to trace the man shown in the image above as it is believed that he may have information that can assist them with their enquiries. “Anyone with information is asked to contact Greater Glasgow CID on 101.”