Defender - Rob Gronkowski
At 6-foot-6 and 265 pounds, Gronkowski is massive, and can at times appear a bit out of control with the ball in his hands. That makes him perfectly suited to mess things up for opposing offenses in front of goal. He'll also be very valuable getting his head on corners.
Midfielder - Clay Matthews
Matthews will man the defensive midfield position, playing a role of enforcer to intimidate opposing strikers. Matthews has shown a great sense of anticipating plays in the NFL (at no time was that more evident than in Super Bowl XLV, when he forced a Rashard Mendenhall fumble at a pivotal moment in the game), and that ability will translate well to soccer. Matthews also gets a nod due to his hair. All soccer teams need a player or two with outlandish hair. Matthews fits that role very well.
Midfielder - Robert Griffin III
Griffin's rare skill set makes him an ideal fit as a central midfielder. His combination of smarts, speed and ability to properly distribute the ball will help him control the flow of the game and set up what promises to be a potent goal-scoring offensive threat.
Midfielder - Cam Newton
Newton has an obvious knack for creating explosive plays, scoring a rookie record 14 rushing touchdowns in 2011. That free will to score when the opportunity arises will be presented frequently to Newton on the pitch as an attacking midfielder. In the NFL, RG3 and Newton -- two of the most exciting young quarterbacks to hit the league in quite some time -- would never hit the field together. But on NFL United, this dream pairing can wreak havoc in the midfield. At 6-foot-5, Newton will also be a stout presence on corner kicks and crosses.
Midfielder - Darren Sproles
Sproles' diverse series of skills on the football field -- runner, returner, receiver -- qualify him to play winger on this team. Wingers are typically fast, tricky and capable of playing both in defense and attack (Sproles will almost exclusively play in attack on this team, however), though he'll have to work on his ability to cross the ball using either foot. Adrian Peterson was also considered for a role in the midfield, but concerns over fitness eliminated him from the starting 11.