British and Irish Lions flanker Sean O'Brien is the latest player from the second test under scrutiny, after his swinging arm forced All Black Waisake Naholo off the field.
Video of the incident in the 59th minute appears to show O'Brien making contact with Naholo's jaw with his arm after the All Blacks wing received the ball from a kickoff.
Naholo left the field soon afterwards for a head injury assessment and did not return, casting doubt on his availability for the third and deciding test in Auckland on Saturday.
Meanwhile Sonny Bill Williams will face a judiciary hearing to determine his fate ahead of next week's decisive third Test.
The All Blacks will take on the British and Irish Lions at 7.35pm Saturday.
