Lambeth Council closed Brockwell Park on Saturday, following a shooting incident overnight which is being investigated by the Metropolitan Police.
The victim was taken to hospital and his condition has been assessed as non life-threatening.
The council will continue to work with the community, businesses and local organisations to share information and provide reassurance.
Anyone with information that may assist the investigation is asked to call 101 and quote CAD reference 746 of 14th May 2022.
Alternatively they can call Crimestoppers or contact fearless.org.