On January 8, 2011, Johnson signed a seven-year extension with the Kings. At the time of the deal, Johnson led all Kings' defensemen in points scored with four goals and 24 assists. The contract carried an annual $4.3 million salary cap hit. He would end the 2010–11 season with a career-high 42 points, ranking sixth among all Kings skaters. His 2011–12 season with the Kings, however, would be a tough one, as he failed to score at the pace he set in the previous season, recording only 24 points in 61 games by February 12, 2012.