Ryan Giggs feels Iceland's knowledge of each other and discipline to operate as a team stems from playing together over the years.
Prior to Iceland's 5-2 Euro2016 quarter-final loss to France on Sunday night, Giggs spoke of the togetherness he has noticed in the Nordic minnows, which is similar to what he experienced with the likes of David Beckham, Paul Scholes, Gary and Phil Neville and Nicky Butt while coming through the ranks at United.
"You can't emphasise how important that is," he said on ITV.
"I was lucky enough to play with a group of players I'd played with for seven, eight years by the time we got into the first team.
"You know each other inside out and you don't hesitate in a game, both defensive and offensively. You know you are being covered by a teammate.
"When I was playing left wing for United, I knew where Becks, I knew where Scholesy was going to put the ball, and they knew where I was going to run.
"It's really important. It's the way that the play. They are drilled. You are talking about their organisation, an they will be organised.
"If they play 4-4-2 quit simply, they do it really well."