Real Madrid are targeting Spurs’ attacking midfielder too.
And it appears the 21-year-old could be at the centre of a transfer tug-of-war between Europe’s elite clubs.
Jose Mourinho wants to add more creativity to his United team.
Having missed out on signing another winger this year, plans are being made ahead of next summer.
United are prepared to spend big as well to ensure they can compete for the Champions League.
According to Spanish outlet Don Balon, the Red Devils are willing to pay up to around £180m for Alli.
United are hoping to see of competition from Real for his signature.
And Tottenham could face turning that sort of money down difficult.
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Should Mauricio Pochettino’s side fail again this season in their quest for silverware, Spurs’ star players may leave.
Harry Kane has also been linked with a move to the Bernabeu.
But Manchester United do not want to lose out in the hunt for England international Alli it seems.
Barcelona have also been credited with interest in the former MK Dons player.
It remains to be seen who will win the race and whether Alli will stay in north London in 2018.