A 20-year-old man was with a male friend in Old Rutherglen Road when another man attacked him with a weapon at about 13:05 on 22 September.
The victim was treated in hospital for a leg injury.
Detectives believe the man in the images may be able to help with their inquiry. He is described as white, aged about 20, with short brown hair.
At the time of the incident, he was wearing a tracksuit top that was white at the front and light blue at the back, dark tracksuit trousers and dark trainers.
He was last seen walking on Caledonia Road towards Cathcart Road.
Det Con Nicol McPherson said: "This was a violent attack that took place in broad daylight which left this man with a serious leg injury.
"I would urge anyone who recognises the man in the images, or who has information that may assist the investigation to contact Cathcart Police Office."

A statement says to meet the criteria for the revamped 2014 Super League they had to establish a partnership with a men's club or similar institution.
It is the chairman's belief that by incorporating the ladies' team with the men's team, we can develop a one-club mentality
The club say the shared chairmanship of Ray Trew will bring "mutual gain".
"The players will have access to the kind of facilities and resources the Notts squad have," the statement read.
"This was another key driving factor. Together with the benefits for the playing staff, there are numerous off-field advantages also, with the ladies' side able to tap into the well-established commercial, media and marketing facilities available at Notts County."
Many Lincoln Ladies supporters were angered by the move, which will see the club playing their home games around 35 miles away from their current temporary home at Lincoln City's Sincil Bank.
The Lady Imps, who had an application to relocate blocked by the FA Women's Super League in 2012, say they understand fans' concerns and "are working closely with organisations in both Nottingham and Lincoln to ensure that following the club in our new home will be as easy and affordable as possible".
The statement added: "It is the chairman's belief that by incorporating the ladies' team with the men's team, we can develop a one-club mentality that will benefit both sides and aid growth of the combined brand."
Lady Imps player Megan Harris told BBC Lincolnshire: "It's a really tough situation. I have been with Lincoln since the very beginning so it is hard to see something that I have been part of move.
"But obviously I work for the club as well and can see behind the scenes and what's going on and how the women's game is progressing. It is turning into much more of a business now and money is starting to talk.
"Liverpool are sitting top of the Super League because they had a massive cash injection and the men's team are backing them. If you want to compete at the highest level then that's what you have to do."

Swindale Beck, near Haweswater, was straightened to clear land for grazing, but the resultant faster flows washed gravel away, making it less easy for salmon and trout to spawn.
During summer a stretch was filled in and replaced with a meandering course.
In December, 16 salmon were spotted, along with five redds - disturbed gravel where eggs had been laid.
The bend restoration project, involving United Utilities, the RSPB, Natural England and the Environment Agency, was also aimed at alleviate flooding by slowing the flow of water through the valley.
Lee Schofield, RSPB site manager at Haweswater, said: "Habitat restoration is often a slow process and we normally don't see the benefits of our work for years and sometimes even decades.
"It's really uplifting and inspiring to work on a project where we get the chance to experience success so soon after we've finished."

Knaresborough station, in North Yorkshire, is being made watertight and the chimney stack on the signal box is being removed and rebuilt.
Work on the platform canopy is to be carried out at night to minimise disruption, said Network Rail.
Paul Barnfield, for train operators Northern, said: " Knaresborough is a beautiful station, steeped in history."
Police have released CCTV images of a man they want to trace over a "violent attack" in the Gorbals area of Glasgow.
[NEXT_CONCEPT]
Lincoln Ladies have insisted their controversial relocation to Nottingham and decision to play as Notts County next season was their only option.
[NEXT_CONCEPT]
The restoration of natural bends to a river in Cumbria after 200 years has spawned benefits for breeding fish.
[NEXT_CONCEPT]
Renovations have started on a railway station and a signal box dating from the 1800s.