According to Sky Sports reporter Pete Graves, 
Alli debuted for MK Dons as a 16 year old back in 2012 after being promoted from the team's youth set-up. Alli was under the all-seeing eyes of 
Former Spurs manager David Pleat has also recently revealed, in his column for the Daily Mail, the key role he played in bringing Alli to White Hart Lane, saying: "I think over time my consistent, positive reports and my constant verbal batterings held sway when Tottenham chairman Daniel Levy sought assurances over value."
Spurs were ultimately the team to take the chance signing Alli who was a teenager at the time playing for a League One side. But looking back three years on, with 38 goals to his name, Spurs' £5m bet on Alli has massively paid off.