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Mauricio Pellegrino wants video technology to be introduced in the Premier League after Abdoulaye Doucoure's controversial last-gasp equaliser denied Southampton a first win in 10 matches.
The midfielder diverted the ball in with his arm a minute before full-time as Watford came from two goals down to snatch a 2-2 draw.
James Ward-Prowse had scored twice in the first half before Andre Gray pulled one back - and Saints were crestfallen when Doucoure's equaliser was allowed to stand.