The Browns lost their sixth match on the spin when they were defeated on the final play of the game against the Baltimore Ravens as Will Hill returned a blocked field goal for a touchdown.
Pettine has admitted that the club's owner Jimmy Haslam is not pleased with his side's struggles, but the 49-year-old is upbeat that he and his staff can deliver success.
He told reporters: "Anybody that knows me and anybody that knows Jimmy Haslam, our conversations are always blunt. Time is so valuable during the season that we get into a conversation and we deal with topics head on. There's no dancing around them.
"I feel very upset about the record. I've talked about this before, that that's on us. We own it. This is a bottom-line business and where we are isn't good enough. The question is, do we have a plan to fix it? Is it fixable? I feel like we do, but we'll have to wait and see."