Only Stuart Hogg and Tommy Seymour have made the British and Irish Lions' summer tour of New Zealand while 23 players in total from Ireland and Wales - who both lost to Scotland in the RBS 6 Nations - join 16 England players.
Warburton, the victorious captain during the 2013 2-1 series win in Australia, is just the second man after England great Martin Johnson (1997 and 2001) to lead the Lions on two tours.
Perhaps Gatland's most controversial selection decision was to overlook England captain Dylan Hartley, picking instead Hartley's under-study at global level Jamie George, as well as Rory Best and Ken Owens for the hooker slots.
Ross Moriarty, impressive at number eight for Wales in the Six Nations, said he was "shocked and delighted" to be selected, while Ireland's New Zealand-born utility back Jared Payne was another unexpected inclusion.
They kick off with the only easy-looking fixture of the 10-match tour, against Provincial Barbarians on June 3.
Tommy Seymour and Stuart Hogg were the lucky two; others can feel aggrieved. I hung up on Warren first time around, I thought it was the boys [team-mates] messing around'. So we are trying to get the right blend of players for what we need.
With Hartley omitted the hookers are Rory Best, who replaced the suspended England captain four years ago, Jamie George and Wales's Ken Owens.
He rejected the idea that Gatland, who has stepped down as Wales coach to focus on the Lions tour, would unleash an expansive game in New Zealand.
Out in the backs, Jonathan Joseph is selected despite reports which indicated otherwise, while Ben Te'o will also be involved having done enough to influence the coaches during his fleeting Six Nations performances.
Meanwhile, Sam Warburton will join England World Cup victor Martin Johnson as a record two-time Lions captain this summer.
The most high-profile omission by Lions coach Warren Gatland when the squad was announced Wednesday was Hartley, who was captain for England's recent 18-match winning run.
"I'm hugely excited for the challenge coming our way, we have a lot of rugby to be played and here's hoping I can get a bit of game time and show what I've got and I will do everything I possibly can to get a starting place".
Warburton said he would be "100 percent" fit for the start of the tour, despite sustaining a knee-ligament injury while playing for Cardiff Blues on April 7.
"A lot of teams arrive in New Zealand and, I saw this in 2011 (at the World Cup), they weren't prepared for the stuff off the field".
"It's an incredibly tough tour".
Hansen said the Lions would have to face a new type of pressure in New Zealand " pressure they might not be used to but which the All Blacks faced every day.
And Lions assistant coach Rob Howley believes their qualities are "quite comparable" following Wales flanker Warburton's appointment to lead a second successive Lions tour.
Rory Best (Ireland)‚ Dan Cole (England)‚ Taulupe Faletau (Wales)‚ Tadhg Furlong (Ireland)‚ Jamie George (England)‚ Iain Henderson (Ireland)‚ Maro Itoje (England)‚ Alun Wyn Jones (Wales)‚ George Kruis (England)‚ Courtney Lawes (England)‚ Joe Marler (England)‚ Jack McGrath (Ireland)‚ Ross Moriarty (Wales)‚ Sean O'Brien (Ireland)‚ Peter O'Mahony (Ireland)‚ Ken Owens (Wales)‚ Kyle Sinckler (England)‚ CJ Stander (Ireland)‚ Justin Tipuric (Wales)‚ Mako Vunipola (England)‚ Billy Vunipola (England)‚ Sam Warburton (Wales‚ capt).