Police were called to Cossall Walk on Sunday (August 3) at 3.14am following reports of a group of men fighting and the sound of gun shots.
Officers searched the area however the group had dispersed.
Later that night, a man in his 20s went to hospital in south east London with wounds likely to be from a bullet.
His condition is not life-threatening or life-changing.
Earlier that evening, the victim had been drinking in a pub in Peckham.
He left the venue in the early hours of Sunday morning, and made the short walk to Cossall Walk, where he then sat with friends on a bench.
A short time later, it was reported that two masked men came from behind him and fired two shots at the group, hitting the victim.
The two suspects fled the scene, with one making off towards Rye Lane.
Anyone with information is asked to call police on 101, quoting CAD CAD: 1301/03AUG. Alternatively contact Crimestoppers on 0800 555 111.
