The has yet to reach out to head coach regarding the moment in which he lowered his face mask to argue with a referee during the Ravens' 34-20 loss to the on Monday.
"I understand that we're all chasing perfection," Harbaugh said, per ESPN's Jamison Hensley. "We try to be as perfect as we can. It's a pretty hard standard to hold other people to. But you try to do the best you can. That's all I really have to say about it."
Tom Pelissero of NFL Network shared an email from Scott Green, executive director of the NFL Referees Association, to NFL executive vice president of football operations Troy Vincent.