A man has been arrested on suspicion of attempted murder after a 22-year-old was stabbed in the head in Upper Norwood.
The victim, 22, remains in a critical condition after the attack in Brunel Close, on October 11.
He suffered numerous stab wounds including one to his head, which is potentially life-threatening.
A 21-year-old man is currently in custody at a west London police station.
Any witnesses or anyone with information should call police on 0208 247 7821 or Crimestoppers anonymously on 0800 555 111.