Tottenham have appointed Mauricio Pochettino as their new head coach on a five-year contract, the club have announced.
"This is a club with tremendous history and prestige and I am honoured to have been given this opportunity to be its head coach," Pochettino told Tottenham's official website.
"There is an abundance of top-class talent at the club and I am looking forward to starting work with the squad.
"Tottenham Hotspur has a huge following across the world and I have great admiration for the passion the fans show for this team.
"We are determined to give the supporters the kind of attacking football and success that we are all looking to achieve."
Pochettino had a year remaining on his deal at St Mary's and has taken with him assistant manager Jesus Perez, first-team coach Miguel D'Agostino and goalkeeping coach Toni Jimenez.
"We have a talented squad that Mauricio is excited to be coaching next season"
It is unclear what those appointments mean for Spurs' existing backroom team, while there have been reports questioning the future of technical director Franco Baldini.
What is certain, though, is that Pochettino will be charged with securing Spurs a top-four finish by ambitious chairman Daniel Levy after a disappointing campaign, in which a flurry of summer signings failed to gel.
"In Mauricio I believe we have a head coach who, with his high energy, attacking football, will embrace the style of play we associate with our club," Levy said.