The Ravens slumped to 2-2 in their season with a defeat at the hands of the Buffalo Bills against whom his team struggled to run the ball and committed several offensive penalties, while quarterback Joe Flacco threw five interceptions.
"Our run game is not where it needs to be," Harbaugh told the club's official website. "We're going to go to work on that – we have been working on it.
"We'll continue to do so, and we need to make that important. The whole O-line is disappointing right now."
The Ravens face the Miami Dolphins in week five.