For McDowell, missing the 2016 Ryder Cup for the first time in a decade was simply "too hard to take" and he wants to be there helping out in any way he can.
All are expected to be future captains, which has been a common theme among past European vice-captain choices.
"I am honoured to have been selected by Thomas to be one of what I think is a pretty impressive quintet of vice-captains", said Westwood.
Since making his debut in 1997, Westwood has played in the last 10 contests, one short of Nick Faldo's record, and was on the winning side seven times, compiling a total of 23 points bettered only by Faldo (25), Bernhard Langer (24) and Colin Montgomerie (23.5).
"I am delighted to have been asked to be part of Thomas' team of Vice Captains", he said. Who knows, one of them may even spring a surprise victory or two and qualify for the team in a playing capacity.
Thomas Bjorn has announced four more assistants to support him in his bid to return the Ryder Cup to Europe.
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McDowell has made four appearances for Europe and famously secured the winning point at the 2010 match at Celtic Manor, where he defeated Hunter Mahan on the 17th hole. "I can't wait to get started and help in any way that I can, and I'm very much looking forward to the challenge".
The Ryder Cup is unlike any other tournament in golf and the atmosphere is something that every golf fan should experience. "They have a very strong team but so do we".
"I'm excited to take on a slightly different view of things and help the 12 players be as ready as they can to regain this trophy", added McDowell, who hasn't yet ruled out earning a place on the team as a player and has won the French Open twice at this year's venue.
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Trusting what we do best, and whether it's the first quarter, second quarter or crunch time in the fourth, we've got to be us". Tucker, Harden and Chris Paul all over that 40-minute mark, you'd think the Rockets would be the team that was exhausted .
McDowell is a two-time victor of the French Open at Le Golf National, site of the Ryder Cup.
"You only need to look at the record books to see that their Ryder Cup pedigree speaks for itself".
The 2018 Ryder Cup itself, the 42nd staging of the contest, will be played at Le Golf National, France, from September 28-30, where Europe will try to regain the trophy following defeat at Hazeltine National past year, with the aiming of extending an impressive winning record on home soil which stretches back to Valderrama in 1997.
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Bjorn said the primary quality of any vice-captain is to 'check your ego at the locker room door, ' and both certainly did a good job of that when officially unveiled on Tuesday, given they're two of the youngest deputies in Ryder Cup history.