The head coach told the team's website: "I'm not going to sit up here and make excuses. We had 20 missed tackles. I don't know how you think you're going to play good coverage football, on special teams or even run defense, when you have that many missed tackles.
"Disappointed, frustrated, whatever word you want to use, that's how I feel. We've been playing this way now for a number of weeks, and we have not handled the challenges that our opponents have put in front of us."
The Packers face the Atlanta Falcons this weekend.