Doucoure's late intervention meant the game finished all-square, but Watford have won just once in their past 10 Premier League games.
Speaking on the BBC, Sportsmail's Martin Keown commented: 'Doucoure's done a Maradona there, it's like he's gone to high-five the keeper - that's how high his hand was'.
Used for the first time in England for the national team's friendly against Germany in November, VARs were rolled out in domestic soccer this week for the FA Cup game between Brighton and Crystal Palace on Monday.
However, it is still some way off from appearing in the Premier League. 'If VAR comes in we probably wouldn't get that. "It's the luck of the draw", said Deeney.
Yet Saints manager Mauricio Pochettino was still able to express his disappointment in measured terms.
"My assistant says it's a very clear penalty and a red card also, so it's another decision that creates something important but what can we do?"
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"I am sad. I never see this type of mistake in the Premier League before", Pellegrino told reporters, while also refusing to criticise the referee Roger East, who along with his assistants had missed the handball.
"From the bench it is more hard to see but the referee and the linesman are closer".
Swansea felt they should have been awarded a first-half penalty in a 1-1 draw at Newcastle that left the Welsh club rooted to the foot of the table. "Something can happen and this season we've had decisions go against us". "He's got his hand up by his head - it's as clear a handball as you're ever likely to see. Nothing, only talk about this", said Swansea boss Carlos Carvalhal.
"This is one of the situations VAR will in the future say clear penalty".
Chelsea manager Antonio Conte and Arsenal counterpart Arsene Wenger questioned aspects of VAR after their goalless draw but their criticism was based on technical matters surrounding its use rather than the concept of the system itself.
And even Deeney admitted VAR would have ruled out the goal.