The Green Bay Packers host the Minnesota Vikings in a crucial NFC

The Green Bay Packers host the Minnesota Vikings in a crucial NFC North tilt, and the Baltimore Ravens and Pittsburgh Steelers renew their back-alley brawl of a rivalry. Elsewhere, Robert Griffin III and the Washington Redskins attempt to remain in the thick of the playoff race when the division-leading New York Giants pay a visit on Monday night. It's not an easy thing for the NFL's fifth-ranked quarterback to deal with this week, even though Smith already has experienced plenty of ups and downs in his tumultuous career since the 49ers made him the No. 1 overall selection of the 2005 draft. Smith spoke with the media Thursday for the first time since coach Jim Harbaugh made Colin Kaepernick the team's starting quarterback for Sunday's game against the St. Louis Rams, a rematch of the last game in which Smith appeared. Smith is now completely healthy from the concussion he suffered in that Nov. 11 game and has been medically cleared to play. But he'll be Kaepernick's backup for the second consecutive week. Smith is uncertain what Harbaugh's decision means for him the rest of this season. "I feel like the only thing I did to lose my job was get a concussion," Smith said. Smith was playing some of the best football of his career when he was injured and left early in the second quarter of the 24-24 tie with the Rams. He completed 7 of 8 passes with a passer rating of 143.8 against St. Louis, throwing for his 13th touchdown of the season on his final pass. The week before, Smith completed 18 of 19 for 232 yards and three touchdowns during a win over Arizona, setting an NFL record with a 94.7 completion percentage for a quarterback with a minimum of 15 attempts. He was named NFC Offensive Player of the Week for the first time two days later.