Speaking on BBC 5 live Olympics, the Hollywood star remarked: “If you get a snap shot of those two teams (NZ v Japan) 100/100 people say that New Zealand is going to win that game,” he added. “Then Japan comes out, super keen, really fast, obviously believing they could win.”

McConaughey’s observations accurately recount what has been the shock of the tournament so far, as Japan mustered the same spirit that saw them beat South Africa in the 15 man version of the game at the World Cup last year, to take out the most successful sevens nation in history, New Zealand, 14-12.

McConaughey is in Rio for a week with his Brazilian wife Camila, and admits that getting to the Olympic venue – the Deodoro Stadium – isn’t easy.

“I’m loving it,” the 46-year-old Texan said regardless.

“Once the party has started, you’re not going to throw a better one than Brazil.”

Asked whether he’s currently meant to be shooting a movie, McConaughey replied: “This is my movie now.”

Day two of the men’s rugby sevens is underway, where group winners will be decided.

Day two group fixtures & results:

France 26 – 5 Spain

South Africa 5 – 12 Australia

Kenya v Japan

New Zealand v Great Britain

Argentina v Brazil

Fiji v USA

After a break at 6pm, the action will resume at 8pm, when the knockout stages will commence.

To listen in full to Matthew McConaughey’s thoughts on the Rio Olympics and rugby sevens click here: http://bbc.in/2bdhTcD