The man was stabbed following an altercation in the city's Duke Street at around 12.50 on Saturday afternoon.
Police are now hunting the suspect, describes as of 'thin or gaunt' appearance, while his victim was rushed to the Glasgow Royal Infirmary.
His condition is described by hospital staff as stable.
“The suspect is described as white, of thin/gaunt appearance, short black hair. He was wearing a black jacket, possibly a leather one.
“Any witnesses to the attack or anyone who recognises the description of the suspect can contact Shettleston CID via 101 quoting reference number 1999 of the 6 July 2019. Alternatively, Crimestoppers can be contacted in confidence on 0800 555 111.”