From the Manchester Union Leader (LINK):
Junior Sean Goldrich suffered a sprained MCL of his right knee in the fourth quarter of last week's win over Richmond. He will be replaced Saturday by former starter Andy Vailas, who battled Goldrich for the starting role. Vailas has thrown for 3,050 yards and 27 touchdowns in his career with just 10 interceptions. He's also run for 719 yards.