New Zealand hooker Andrew Hore has been called "a disgrace" by Wales assistant coach Rob Howley after striking Bradley Davies in Saturday's Test in Cardiff.
The incident forced Davies to leave the field in the opening minutes of the match and has been widely condemned by fans and the media after video content of the incident circulated online.
Hore's blindside shot on the Cardiff second row has been cited, with the hearing on Wednesday.
"What Hore did has got no place on a rugby field, as far as I am concerned," said Howley.
"It was an absolute disgrace. He has been cited, and I am sure it won't be taken too lightly.
"Situations and incidents like that have no place on the rugby field, and it had a huge impact on the game.
"You don't traditionally think the All Blacks want to do things like that. They are a good enough team not to so we were very surprised by the actions of the player.
"Bradley has severe concussion and cannot play this weekend.
"It was pretty obvious that something untoward had happened.
"Whether the referee should be able to go to the TMO in those situations is something for the IRB to decide."