Johnson (knee) is listed as active Sunday at San Francisco, Darren Urban of the Cardinals' official site reports.
Since the Cardinals' Week 9 bye, Johnson has managed just 121 rushing yards at a 2.8 YPC clip across two games. However, previous success against the 49ers (110 yards and two touchdowns in Week 3) has contributed to their standing as second-most yielding under standard scoring conditions in the current campaign.