He has got great experience in the USA, so he won't be intimidated.
The three-times major victor had been the clear favourite to succeed Denmark's Thomas Bjorn for the next tournament at Whistling Straits, Wisconsin, having served as vice-captain at the last three Ryder Cups.
Harrington played Whistling Straits in PGA Championships there in 2004, '10, and '15.
The Irishman said: 'Obviously I'm thrilled to be named as Ryder Cup captain for 2020, it's not something I went into lightly. "A losing captain, it's his fault".
Harrington has a wealth of experience when it comes to the Ryder Cup.
"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. I am very much looking forward to taking on this role". This is not like being a football manager where I lose this week, I play next week and if I get the sack, I'll get another team. You don't get that regularly. "Hopefully I will pull it all together and say the right things at the right time, get a team, get the best out of that team and get a winning performance".
Europe defend the trophy won by Thomas Bjorn and his team at Whistling Straits in Wisconsin in September 2020 and it will be Harrington who will lead the team.
Harrington, who is now out of action after slipping and breaking a bone in his wrist, says selecting five vice-captains is "a must" and now favours three wildcard picks.More news: Chrome's Ad Blocker Goes Worldwide in July
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"I think the standard of golf on the European Tour and the players we have on tour is going to ensure that".
Harrington was the presumed captain all along, which clears the way for Lee Westwood to take the reins in Rome in 2022.
"It is important to me that I got that support".
"You can't do everything as a captain, your very much defined by the quality of your vice-captains and you have to rely on them a lot".
"Players are interested in being under me as a captain. I want to be a help to the players and to leave the Ryder Cup in the better place".
It's vital to serve an apprenticeship as a vice-captain so that, when you get your turn in the top job, you know every detail and you also know how important your backroom team is. Thomas Bjorn had four a year ago and was undoubtedly glad of them as Sergio Garcia, Henrik Stenson, Ian Poulter and Paul Casey all failed to qualify automatically.
Bjorn signed off his captaincy by fulfilling his promise to have a tattoo of the winning scoreline after Europe regained the trophy.