Police were called by LAS at 9.45pm on Sunday, 17 November to Beulah Hill, near the junction with Knight’s Hill, SE19, following reports of a shooting.
Officers attended and found a man aged in his 20s suffering from a gunshot injury.
He was taken to a south London hospital, where his condition is thought to be critical but stable.
The incident is thought to have happened at a petrol station and the victim was discovered further down the road.
A Crime scene and road closures remain in place.