The male victim was attacked n the Cornshell Fields area of Derry during the early hours of Monday, December 2, 2019.
As part of a CID probe, detectives arrested a 23 year old man today.
Detective Sergeant Richard Donnell said: “The man was arrested in Derry today on suspicion of a number of offences.
“This includes attempted murder, wounding with intent to do grievous bodily harm and possession of an offensive weapon with intent to commit an indictable offence
“He is currently in custody assisting us with our enquiries.
“The assault, which left a 28 year old man in a critical condition in hospital, is believed to have involved four men, who left the scene in a grey coloured Volkswagon Golf, and our enquiries are ongoing to identify all those involved.
“I would continue to appeal to anyone who witnessed the incident or anyone who may have seen a grey coloured Volkswagen Golf in the area at the time to contact detectives in Strand Road on 101 quoting reference 107 02/12/19.
“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.”