Although he left hospital after a scan, a decision on his further participation in the third and final Test against South Africa will be made after consultation with a neurological specialist Sunday morning.
"It depends on his symptoms," said team physiotherapist Alex Kountouri.
Langer ducked into a short ball from Makhaya Ntini and was hit on the right earpiece of his helmet. He collapsed to the ground and after receiving treatment on the field was helped off, stumbling as he took his first steps.
Kountouri said Langer suffered "significant concussion" and a cut on the back of his head which required two stitches. He was examined by a doctor at the ground before he was taken to hospital for a precautionary scan.
"It's always a worry when you have a head injury," said Kountouri. Describing Langer's condition immediately after suffering the injury, Kountouris said: "He felt his arms and legs were weak. When he sat up he felt dizzy, he was getting a headache, he didn't feel steady on his feet and he was struggling to put one leg in front of the other."
Kountouris said Langer was feeling much better by late Saturday afternoon. "But he's pretty weary. He suffered a significant concussion."
Langer's parents, Colin and Joy-Anne watched the on-field drama from seats in the grandstand of the Wanderers Stadium.