The 21-year-old was signed by the Argentine manager in 2015 from MK Dons and has become a first-team player for both Spurs and England.
Speaking about Pochettino, Alli told Sky Sports News: "He's massive to me, a big help with everything, every day in training and in everyday life he pushes you, making you a better person and player.
"He's a massive role in my career; we work together a lot, we speak a lot, and I think that is important for a young player, to know you have a manager you can trust and speak to.
"He wants to help you improve and push you on. We trust in him, we put all our trust in him here, and that's the main thing. We know that the decision he makes is the best for the team and it's important that we stick by that."
Alli has made 11 appearances for Spurs since his move to North London, scoring 39 goals and registering 27 assists.