Ange Postecoglou says "it was a tough decision" to leave Celtic, but he could not resist the challenge of "a rebuild" as Tottenham Hotspur manager.
The 57-year-old left Celtic Park in early June after two years in charge during which he led his side to five domestic trophies from a possible six.
"We had some fantastic success and great moments within that and I'll cherish them, but I am the kind of guy who always loves a challenge - I love a build, I love a rebuild," he said at his first Spurs media conference.
"That's where I feel I am at my best and this challenge, when it came along, I just thought had all the elements of what I need to get going again.