A member of staff from the Royal Oak Bar, Green Street, was attacked around 9.40pm. Two men have since been arrested.
He said: “I must condemn this horrifying attack which has left the victim with serious head injuries.
“The extent of the injuries indicates this was a brutal attack, made all the more chilling as the victim was simply carrying out his duties on a Saturday night as an employee of a popular local bar.
“My thoughts are with the victim, his family and wider circle and I hope we hear positive news on his condition in the hours and days to come.
“I urge anyone with information to contact the PSNI as soon as possible so a full, clear picture of what occurred can be established.”