The new stadium site is next to Tottenham's existing White Hart Lane home. Adam Davy/PA Archive/Press Association Images

Tottenham Hotspur chairman Daniel Levy has said the National Football League is involved in "every aspect" of the club's new stadium project after holding discussions with NFL executives this week.

The 61,000-seater stadium, due to be completed for the start of the 2018-19 season, will host a minimum of two NFL matches per year for 10 years under a deal announced last year.

The ground -- adjacent to Spurs' current White Hart Lane home -- will feature facilities for both sports, including a retractable grass football pitch with an artificial NFL surface underneath and two sets of changing rooms.

A 10-person delegation of NFL officials has visited the site twice in the past week and Levy said they were having a significant input into the construction process.

"We're going into detail about all the areas we are sharing. They are very involved in absolute detail of every aspect of this stadium," he told Spurs TV.

"It's very important that they buy into the construction process.

"They really engaged, and now we have regular weekly meetings."

Although Spurs are focused on staging one-off NFL games in the same way as Wembley has done previously, there is the longer-term potential for the stadium to be home to a permanent NFL franchise in London.

Mark Waller, the NFL executive vice-president, said the organisation was also discussing sponsorship and training facilities with Tottenham.

"We've always said we need to have options in London over where to play our games, and the fact that in this stadium we'll be able to have the roll-in roll-out field means we'll always have the opportunity to play," he said.

"We're building a huge new relationship. There's a whole raft of conversations to take place."