Tony Romo replaced as make-or-break time arrives for NFL play-off spots Back surgery: Dallas quarterback Tony Romo. WASHINGTON: The National Football League's last four play-off berths will be decided by Sunday's final regular-season games, two of them showdowns in which the winner advances and the loser is done. Chicago entertain Green Bay and Philadelphia will visit Dallas, with the winners in each capturing a division crown and first-round home play-off game and the losers packing up for the season. Dallas quarterback Tony Romo, who had back surgery on Friday for a herniated disc, will be replaced by seldom used backup Kyle Orton when the Cowboys host the Philadelphia Eagles to decide the NFC East champion and a play-off spot. Romo threw for 3828 yards and 31 touchdowns in 15 games this season. It is the third year in a row in which the Cowboys will make or miss the play-offs based on their final game, having fallen to Washington and the New York Giants the past two years. Green Bay quarterback Aaron Rodgers was named on Thursday as the Packers' starter at Chicago against the team that sidelined him in a road triumph last month. A victory gives the Bears or Packers the NFC North crown and spells the season's end for the loser of the NFL's oldest rivalry, which will be contested for the 188th time. Seattle, Carolina and San Francisco have secured National Football Conference play-off spots with the Chicago-Green Bay and Dallas-Philadelphia winners joining them. The sixth and final NFC spot will go to New Orleans or Arizona. New Orleans can clinch the berth by winning at home over Tampa Bay but anything less would allow the Cardinals to take the final wildcard berth by beating visiting San Francisco. Seattle can seal a home-field edge throughout the path to the Super Bowl with a home win over St Louis but a loss could let San Francisco overtake them for the NFC West title. Carolina need a victory at Atlanta to win a first-round bye and the NFC South division crown. In the American Football Conference, play-off spots were clinched by division champions Denver, New England, Cincinnati and Indianapolis as well as wildcard qualifiers Kansas City. That leaves Miami, Baltimore and San Diego at 8-7 and Pittsburgh at 7-8 vying for the last wildcard spot, all the clubs needing help from results in other games to advance. Miami need a home victory over the New York Jets and either a loss by Baltimore at Cincinnati or a San Diego home victory over Kansas City. Pittsburgh need a win and losses by the other three contenders to reach the play-offs. If all four teams lose, the Ravens advance. Denver clinched a first-round play-off bye but must win at Oakland or have New England fail to beat visiting Buffalo to ensure the Broncos have a home-field edge all the way to the Super Bowl. Cincinnati could deny New England a first-round bye with a victory if the Patriots falter against Buffalo and Indianapolis could take the bye by beating Jacksonville if the Patriots and Cincinnati both lose.