Alli has reached an agreement over fresh terms with the Lilywhites after indicating his desire to stay.
Dele Alli has expressed his joy at signing a new five-and-a-half-year contract at Tottenham.
The England international put pen to paper on a deal that will see him remain at the north London club until 2024.
"Would like to say a big thank you to everyone at the club - chairman, manager, all my team-mates and the fans for their constant support," he said on Instagram.
"I've loved my time at Spurs so far and I'm very excited to see what the future holds! #COYS"
The midfield ace - who returned from a hamstring problem as a substitute in Spurs' 1-0 defeat to Manchester City at Wembley on Monday - joined the north London side from MK Dons back in 2015 for £5m and has scored 48 goals in 153 competitive appearances.