Highlanders Chief Executive Roger Clark said the investigation involving Frizell was a "distraction" for the team but his omission was not punitive.
"I think it is important for us all to remember at this time, these are all allegations and no charges have been laid.
"However, these have been a distraction for the player, and the team. And in the best interests of everyone concerned, we are going to omit Shannon from the team this week."
Frizell was reportedly alleged to have been involved in an assault on a woman at a bar early on Sunday.