While there eyes of the sporting world may be on Wisconsin this week due to the Ryder Cup, it is usually an oval rather than a round ball that dominates the headlines in America's Dairyland.

Just 61 miles north of Whistling Straits lies the city of Green Bay, home to the Packers, one of the NFL's most-storied franchises with 13 league championships including four Super Bowls in their trophy cabinet.

In honour of the local heroes, the European team wore their colours in practice on Wednesday and even their trademark cheeseheads on the first tee, much to the delight of the local fans.

"It is a nod to Wisconsin and obviously to Green Bay that we've gone with this, we've gone with the colours," said Captain Pádraig Harrington.

"And obviously the cheeseheads and throwing the things up there is a bit of fun for the fans that are here. The Wisconsin fans are very appreciative, so we want to show our appreciation back.

"It's nice. We think the colours turned out nice. We think the outfit looks really good, and I think the players are pretty stoked out there that they're doing something to show their respect for the local state we're in."