The vicious attack happened in the Gordon Street area of Belfast in the early hours of this morning, Saturday, June 2.
Detective Sergeant Adam Ruston said: “Shortly after 1:30 am a man in his 30s was attacked closed to licenced premises in this vicinity.
“The man suffered head injuries as a result of the attack and is currently in hospital receiving treatment where his condition is described as serious.
“Police subsequently arrested a man in his 30s and a man in his 40s in relation to the incident and they remain in custody at this time.
“Anyone with information is asked to contact 101 quoting reference 153 02/06/2018.
“Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.”