Beauden Barrett still suffering concussion symptoms

All Black Beauden Barrett remains in doubt to line up for the All Blacks on Saturday, as he is still experiencing concussion symptoms.

Barrett suffered a head knock in New Zealand's win against the Springboks and did not take part in the final 30 minutes of that match.

"He had a couple of symptoms through training over the last few days so he is just following normal protocols, really," All Blacks assistant coach Ian Foster said.

"We will progress him based on what happens the day before.

"He had symptoms two days ago after training so he will have a session in the gym today but overall, how he responds to that session will determine what happens tomorrow."

Should Barrett be ruled out the All Blacks have two options:

Shift Damian McKenzie to flyhalf from fullback, or hand Lima Sopoaga a start, with Richie Mo'unga likely to come onto the bench.