The 19-year-old has shone this season - and are Spurs already on the lookout for more teenage talents?
Moving from MK Dons to north London, Alli has made a seamless transition to Premier League football, settled into Mauricio Pochettino's first team, scored several goals and also made a name for himself as an England international.
As such, the teenager's contract has already been renewed and, in terms of value for money, Alli is looking like one of the very best signings in Premier League history.
And could Spurs already be looking to find 'new Allis' and using his success to influence their transfer policy?
Pochettino, Daniel Levy and co have been focusing on signing younger players for some time now but perhaps the 19-year-old has convinced them to go a step further.
Alli's success has likely played a part in promoting such bold thinking. Spurs could, from now on, skip the middle man and not loan the youngsters they sign out but rather put them straight into the first-team fold like Alli.
It may even shift Tottenham away from the likes of Saido Berahino - young but with plenty of experience already, not to mention baggage. Instead, the north London side could strike very early on from now on and use a player's potential, combining it with their own training, to give them the most hands-on training possible - playing regularly in the Premier League.