Illinois sports information director Kent Brown says the 19-year-old Wilson left the hospital in Urbana on Tuesday and is expected to recover from the injuries.
The sophomore from Chicago was hurt early Friday during a fight at a Champaign bar near the Illinois campus.
Brown says Wilson was helping friend and former teammate D'Angelo McCray, who transferred from Illinois to Eastern Illinois this year.
Police have said the stabbing happened after a group of men surrounded another man at the bar. No one has been arrested.
Illinois coach Ron Zook has said he was proud of Wilson for helping a friend in trouble.