The incident happened at around 1am today (Mon) on George Street in Edinburgh’s city centre.
The victim – who is Chinese – had just left Lulu nightclub and was walking with friends when two men approached them.
The pair, believed to be in their 20s, made some racially-fuelled remarks and then punched the man on the head.
As a result of the blow he fell to the ground, where the two attackers continued to kick him on the head until he lost consciousness for a short time.
The victim was taken to the Royal Infirmary of Edinburgh for treatment but his injuries were not thought to be life threatening.
Police are now appealing for anyone who was in the area at the time to come forward.
Both suspects are described as being around 5ft 8ins tall with medium builds.
One was wearing a red or dark pink top and the other had on a white top.
A spokesman for Lothian and Borders Police said: “We are still investigating the circumstances that resulted in this altercation, which left a man requiring hospital treatment and would urge anyone who was on George Street and witnessed the assault to contact police immediately.
“Similarly, anyone who recognises the description of the suspects or who has any other information that can assist with our enquiries is also asked to get in touch.
“Lothian and Borders Police are committed to reducing crime of a racial or prejudiced nature and will robustly deal with anyone found to be responsible.”
Anyone with any information should contact Lothian and Borders Police on 0131 311 3131, or Crimestoppers in confidence and complete anonymity on 0800 555 111.