The England midfielder is just over a year into the six-year arrangement the player signed last September - but it is understood Alli has been approached by Spurs to offer him fresh terms and another significant pay rise.
Spurs are allegedly anxious that if Alli is to sign with a super agent like Jorge Mendes or Mino Raiola, they may struggle to negotiate a new deal inside of the club's wage structure.
Alli is likely to be offered around £80,000-a-week to add an extra year to his existing deal, which would put him ahead of Christian Eriksen, but would still leave him some way short of top earner Harry Kane, who pockets roughly £100,000-a-week.
However, the Telegraph report that Tottenham are preparing a new contract and believe they can convince him to sign before he switches agent after next summer's World Cup.
Sources close to the England worldwide claim that his current wage packet with Spurs has impacted his displays for club and country, while his behaviour has been called into question already this term too.
Alli was handed a one-match global ban following a middle finger gesture in England's win over Slovakia last month, while he was booked for diving in the 4-0 drubbing of Huddersfield before the October worldwide break.