Despite being top of La Liga, Real Madrid are already considering summer reinforcements.
Their attack has shown signs of slowing up in recent months with both Karim Benzema and Cristiano Ronaldo struggling for consistency.
Express Sport understands Tottenham face a battle to keep Alli amid fierce interest from Madrid.
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Gareth Bale wants Real Madrid to sign Tottenham star Dele Alli
Dele Alli has been in stunning form for Tottenham this season
And Spanish outlet Diario Gol claims Bale wants the England international to arrive at the Santiago Bernabeu.
Alli has scored 17 goals and registered eight assists from 39 games so far this season.
Cristiano Ronaldo's influence at Real Madrid is waning
Madrid would likely have to cough up over £86million to land their man.
The Spanish giants could be forced to wait until the very end of the summer transfer window to sign Alli, like they did with Bale in 2013.