The England international rescued a late point for Spurs to deny the relegation-threatened visitors a first Premier League win of the season amid yet more VAR-related controversy.
Tottenham had conceded in the sixth minute and were desperately looking to find a way back into the game when a ball lofted to Harry Kane was punched out by Ben Foster and into Alli’s path, the midfielder controlling it with his shoulder and slotting into the net on 86 minutes.
The video assistant referee reviewed the goal and decided it was correctly awarded but the big screen indicated the decision was 'no goal' - after a spell of confusion, referee Chris Kavanagh eventually made clear the goal stood.
"Much was made of the goal by Dele Alli," the Spurs cult hero wrote on BBC Sport as he named Watford's Craig Dawson in his team of the week.
"The finish was excellent but the handball that preceded it was definitive for me and the goal should not have stood. However Spurs are in desperate need of a bit of luck and so is Alli."
An earlier incident saw Watford appeal for a penalty in the first half when Jan Vertonghen's trailing leg brought down Gerard Deulofeu in the box but VAR decided that Kavanagh had not made a clear and obvious error in not awarding a penalty.
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