ARLINGTON Brandon Marshall Color Rush Jersey , Texas (AP) — Seattle kicker Sebastian Janikowski is out of a wild-card playoff game against the Dallas Cowboys after injuring his thigh while missing a 57-yard field-goal try on the final play of the first half.The 40-year-old Janikowski grabbed the back of his left leg and yelled as the kick sailed wide right Saturday night. He limped to the locker room.Rookie punter Michael Dickson tried some short field goals during halftime, with mixed results. The Seahawks have also pondered using Dickson for drop-kicks in field-goal situations. He had several drop-kicks during the season, as recently as Week 16 when Janikowski left with an injury but returned to the game.The Seahawks went for it on fourth-and-5 from the Dallas 39 in their first possible field-goal situation of the second half, converting on Russell Wilson’s 22-yard pass to Doug Baldwin. After Wilson ran 4 yards for a touchdown Cortez Kennedy Color Rush Jersey , Mike Davis scored on a 2-point conversion run for a short-lived 14-10 Seattle lead. The Seattle Seahawks are struggling badly against the San Francisco 49ers in the first half of a game that would net them a playoff berth with a win. With the defense playing poorly, this injury news will not help matters. Bradley McDougald is doubtful to return after hurting his knee.McDougald, who already forced a fumble in the opening quarter, has been battling a knee injury all year and “doubtful” to return could mean something more serious. Shalom Luani Shaun Alexander Color Rush Jersey , Delano Hill, and Tedric Thompson are the only healthy safeties the rest of the year.Long-term, if McDougald’s injury is serious, it would be a huge blow to the Seahawks defense to lose one of its best starters. Both Thompson and Hill have been picked on by 49ers QB Nick Mullens throughout the afternoon Jarran Reed Color Rush Jersey , which is a bad sign considering they play the Kansas City Chiefs next weekend.Seattle currently trails the 49ers 14-13 in the 2nd quarter.