The Irishman was named captain of the Europe team for the 2020 competition at the Whistling Straits course in the American state of Wisconsin.
Bjorn's side put on a ruthless display while outplaying the United States in a 17.5-10.5 victory at Le Golf National in September a year ago.
With memorabilia such as replica trophies and some of Harrington's equipment, it will become even more popular if he can bring home the coveted Ryder Cup trophy.
I'm thrilled. It's not something I went into lightly.
'You could look at this as being a natural progression from player to vice-captain to captain but it's not something I take on without a certain amount of trepidation.
"I think the standard of golf on the European Tour and the players we have on tour is going to ensure that. I'm really conscious that I have to find that edge and add to it".
Couples captained the U.S. to three straight Presidents Cup triumphs from 2009 to 2013 and was a vice for the next two, but in 2017 he stated he felt his opportunity to oversee a Ryder Cup had "passed by".
The defender, who can play at centre-back as well as right-back, moved to the Bundesliga from Lille in 2016 and soon established himself as a star man for Stuttgart, starting all 34 league games last season.
Harrington played in six Ryder Cups and was on the winning team four times.
"I know we're going to a new venue.
I want to be a winning captain".
Harrington has promised to "find an edge" but it's the United States who are favourites to land the Ryder Cup on home soil at 8/13, with Harrington a 6/4 shot to win the match and defend the trophy the Europeans won so emphatically in Paris past year.
Harrington played in the biennial event in six consecutive contests, including winningm teams in 2002, 2004, 2006 and 2010.
"You know when you're going up against a guy like that that he is mentally tough and strong".
Steve Stricker is expected to be named the Captain for the 2020 US side, and Harrington previously said thinks he will be a "nice" Captain, but says he is not to be underestimated.
"It's something that you'd better embrace because you know it will have that asterisk (next to your name) if you don't win it".