Open champion Francesco Molinari, Justin Rose, Tyrrell Hatton, Tommy Fleetwood, Jon Rahm, Rory McIlroy, Alex Noren and Thorbjorn Olesen had automatically qualified for the Europe side.
But team captain Thomas Bjorn has now added Paul Casey, Sergio Garcia, Ian Poulter and Henrik Stenson.
Team USA captain, Jim Furyk, named Bryson DeChambeau, Phil Mickelson and Tiger Woods as three of his four wildcard picks on Tuesday,
That adds to the roster of US Open and US PGA Championship champion Brooks Koepka, Masters winner Patrick Reed, world number one Dustin Johnson, Justin Thomas, Bubba Watson, Jordan Spieth, Rickie Fowler and Webb Simpson.
Poulter was the most likely player to be included by the skipper and Bjorn explained exactly why he handed the 42-year-old a fifth call-up.
“When he won on Houston, I though he was on the track to be part of this team,” Bjorn told Sky Sports.
“He does it on the big stage and is the man for the occasion.”
The most surprising addition to the team is Swede Stenson.
“He is a very good guy to have around a strong player,” Bjorn added.
“All four of them (picks) are easy to partner up with the other players among the first eight.”
Garcia was perhaps another slightly surprising addition to the squad.
“The one thing about Sergio is the heartbeat of the team,” the captain added.
“Not only is he a fantastic golfer, he goes out and does what he does in Ryder Cups.
“You need people that has been there and done it and been through it all, positively and negatively.”
And reflecting on the overall squad, Bjorn was delighted with how it has come together.
“If I had written down 12 names at the start of the captaincy, I wouldn’t have been far away from what I have,” he said.
“I know what we’re up against, but I’m confident we have a group of guys who can do the job.”