Energy from cigarette butts, a retractable pitch & multiple arenas - the NFL stadium innovations Man Utd could imitate for revamped Old Trafford

Manchester United's pre-season tour of the United States is in full swing and Erik ten Hag's side got off to a flying start with an impressive 2-0 win over Arsenal at a sold-out MetLife Stadium in front of 85,000 fans, a record crowd for a football match in the state of New Jersey.

But while Ten Hag is fine tuning his squad in preparation for the looming Premier League campaign, senior United figures are also making the most of the experience. According to the Manchester Evening News, the club are analysing the stadiums they are playing in during the tour and looking for inspiration as they consider upgrading the historic, but outdated, Old Trafford.

United have appointed the architects who designed the Tottenham Hotspur Stadium to come up with plans for their home ground, with Spurs' shiny and impressive ground, which opened in 2019, having been modelled on U.S. stadia and now hosts NFL matches annually.

As United gear up to play Real Madrid at the NRG Stadium in Houston before finishing their tour against Borussia Dortmund at Las Vegas' Allegiant Stadium, GOAL takes a closer look at the arenas they have been playing in and the design features they could potentially mimic when they eventually renovate Old Trafford...