The victim was at the Farmers Arms public house on Longley Lane on Tuesday 6 September 2011. He had spent the evening with friends who later left and he continued drinking on his own.
Whilst inside the pub he had a disagreement with staff over a drink and the offender got involved.
He then left the pub on his own.
Outside, the offender started arguing with the victim and then punched him at least twice in the face and head before knocking him to the floor. The offender then stamped on his head at least twice before making off on foot towards Sale.
The offender is described by witnesses as white, about 5ft 7 in to 5ft 8 in tall of average build with a shaved head.
The victim was discharged from hospital after a few hours and sent home.
Detective Constable Andrew Bromley of West Didsbury CID said: "I am certain that someone in the pub that evening will have witnessed the argument inside the pub earlier and might recall information which may lead to identifying the offender.
"This was a severe and extremely violent attack requiring hospital treatment of six staples to the side of the victim⿿s head .
"I am keen to speak to anyone who was in the Farmers Arms last Tuesday night who remembers seeing anything that could help find the person who carried out this vicious assault and help bring the attacker to justice.
"Your information will be treated in strictest confidence".
Anyone with information is asked to call police on 0161 856 6153 or the independent charity Crimestoppers on 0800 555 111.
