CCTV images of the Nechells Medway Tower, Cromwell Street, stab attack suspect
The 31-year-old victim suffered the wounds in a confrontation outside Medway Tower on Cromwell Street around 8am on August 23 and spent several days in hospital.
DC Sarah McDonnell, of West Midlands Police CID, said: "The man had attended a gathering in a flat although he had not been invited and was not known to any of the people there.
"After words were exchanged with the victim, they went outside and got into a fight where the unknown man produced a knife. I urgently need anyone who knows the man or saw him on that Bank Holiday weekend to contact me."
Police arrived at the scene shortly after the attack but the man had fled. Forensic specialists cordoned off the scene to search for clues and everyone at the gathering was spoken to, but the man is yet to be identified.
Clear CCTV images have been recovered from the tower block's systems and police are now appealing for anyone who recognises the man to come forward. He is described as aged around 27 and Somalian. He was wearing a striped short sleeved polo shirt and a distinctive red cap.
Anyone with information should contact DC McDonnell on the 101 non-emergency number or alternatively information can be given to Crimestoppers anonymously on 0800 555 111.