The 18-year-old was arrested on suspicion of attempted murder over a knife attack in an alleyway off Langsett Close, between Upperthorpe and Walkley, on Tuesday night.
POLICE: Stabbing victim in 'very serious condition' after knife attack in SheffieldA 21-year-old man was left fighting for life after being stabbed in his chest.
CRIME: Robbers steal medication from man in Sheffield streetHe was taken to the Northern General Hospital, where he underwent emergency surgery.
South Yorkshire Police said he is in a 'very serious condition'.
Anyone with information should call South Yorkshire Police on 101.