Police were called to a residence near the corner of Hyman Street and D’Avignon Avenue.
However, a police spokesman said the stabbing actually happened earlier this week.
Const. Éric Labad of Montreal police said a friend of the man called the police after not hearing from him for a couple of days.
Labad said the man is cooperating with investigators. Police have arrested one person in connection with the stabbing.
The relationship between the man who was stabbed and the person in custody is not yet known.
The 25-year-old man was taken to hospital and is in stable condition.