Roy Hodgson's Three Lions took on minnows San Marino at Wembley on Thursday and face Estonia in Tallinn on Sunday.
England are aiming to win ten out of ten qualifying games en route to France. Both matches are live on ITV.
The prospect of an NFL franchise to be based at London's Wembley Stadium will be explored in detail, the sport's UK chief has said.
England football matches could be taken around the country again from 2018 if the Football Association secures the NFL franchise for Wembley.
Alistair Kirkwood, managing director of NFL UK, told BBC Radio Five Live: "Moving from one game to three games in a couple of years is a sign of real momentum and fan growth.
"We are going to have a look at seeing if we can grow from that over the next couple of years and see where we go from there.
"We're very interested in exploring the idea of a British-based franchise and seeing if we can pull it off. That's the way of making our sport much more mainstream."
Wayne Rooney edged one goal closer to Sir Bobby Charlton's scoring record as England coasted past Europe's lowest-ranked team
It wasn't until 1990 that England's opponents San Marino first played as a nation in an official match and they've only ever won once
England matches could be taken around the country again from 2018 as the Football Association looks to secure an NFL franchise at Wembley