Police are appealing for any witnesses or information regarding a shooting outside the Ministry of Sound in Gaunt Street in the early hours of Saturday 25 June.
It occurred at about 1.40am.
According to police, it appears a large group of youths were causing trouble at the door of the club as they had been refused entry. They turned away from the club and began to harass other customers, including a man sitting in car parked nearby.
When his friend, who was outside the car, saw what was happening, he went to assist.
At that point, the youths surrounded him and one of them shot him in the leg.
They made off from the scene and the victim, a 22 year old man from north London, was taken to a south London hospital by his friend. His condition is described as stable.
Police believe the same youths may have been involved in a later incident, also near the nightclub, around 4am. Police were called to reports of a large group of youths and shots fired. Cartridges were retrieved from the scene.
The ten youths are described as black and in their late teens.
The incident is being investigated by the Met's specialist shootings team from Operation Trident.
DS Jeremy Allsop said there were quite a number of people around at the time of the first shooting. CCTV footage from the scene is being examined.
Anyone with any information should call the incident room on 020 8785 8580, or Crimestoppers on 0800 555 111 to remain anonymous.