NFL positions: Quarterbacks and Linebackers explained... what does everyone do?
NFL positions - Find out how what everyone does including the likes of the quarterback, linebackers and running backs.
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The NFL returns to London today as the Oakland Raiders and Seattle Seahawks battle it out at Wembley.
Seahawks head into the clash as favourites but head coach Pete Carroll is still expecting a tough game in the English capital.
He said: “They’ve got a lot of fire power, they’ve got a lot of offence. It’s a star-studded offensive group that they have there.
“Their quarterback (Derek Carr) is completing over 70 percent of his passes to a bunch of receivers that can make things happen.
“The tight end has been on fire, Jared Cook’s been great. Jordy (Nelson), Amari Cooper, Martavis (Bryant), that’s a good group, and Marshawn (Lynch) is back there to hand it to him.
“They have caught our attention by just the playmaking ability that they have and they’ve got great coaching.
“Unfortunately for somebody, and hopefully not us, it’s just a matter of time.
“These guys are going to get going and get ripping and be close enough to win all of their games.”
NFL positions - what is everyone’s role?
Offence:
Quarterback - Dictates plays by handing the ball off or throwing to a team-mate
Running back - A player who runs with the ball and evades tackles
Fullback - Responsible for blocking for the running back
Wide receiver - A player who elude defenders and catches the ball downfield
Centre - The player who ‘snaps’ the ball to the quarterback on every play
Guard - Inner two members of the offensive line who act as blockers and protect the quarterback
Tackle - Outer two members of the offensive line who act as blockers and protect the quarterback
Tight end - Serves as a receiver but also as a blocker
Defence:
Tackle - To stop running plays or break through gaps in the offensive line to pressure the quarterback
End - To overcome offensive blocking and stop the ball carrier
Linebacker - Line-up behind the defensive line and are usually are the team’s best tacklers
Cornerback - Responsible for tracking the runs of receivers
Safety - The deepest lying players on the field who act as the last line of defence
Why is the NFL in London?
Since 2007, the NFL has run the ‘International Series’ which involves usually three to four games being staged in London each year.
The Raiders and the Seahawks battle it out at Wembley today in the first of three games in the 2018 series.
The purpose of holding games in London is to grow the sport, however, there are also hopes of eventually having a franchise based in the city.
In 2017, NFL executive vice-president Mark Waller said it was "realistic" for an NFL team to make a permanent move to England's capital in the next five years.
And earlier this week he confirmed that those plans were still on track for 2022.
"I feel great about the time frame," Waller said.
"Everything we've seen from the demand on the fan side to the stadium infrastructure that exists, the government support that we have. All of the indicators are incredibly positive.
"The one thing we can never test for is whether a team based here would be able to cope with the incremental travel back and forwards. If and when it happens, that will be a learning we'll get then.
"I think the great thing here is that the market is ready, the fans are ready, the stadiums are ready. As and when our ownership decide that's a move they would like to make, we're ready to go.
"The fan response has been extraordinary, as you'll see in the next three weeks with three sold out games.”