The France midfielder has 70 international caps, 259 Premier League appearances to his name and reports suggest that the transfer fee is in the region of 5 million pounds ($6.89 million).
The midfielder earned a move to the Premier League with Newcastle United in 2013 making 133 appearances for the Magpies ahead of a £30m transfer to Tottenham.
He joined Tottenham in 2016, during his five years in North London, Sissoko played 202 times – including 42 last term – and was named in the 2018/19 Champions League squad of the season after playing a crucial role in Tottenham’s campaign to the final.
The 32-year-old was also the inaugural winner of the Tottenham Hotspur Legends’ Player of the Season award in 2019.
For the national side, Sissoko represented France at the 2014 World Cup and the European Championships in 2016 and 2020, featuring against Portugal and Switzerland at the tournament just two months ago.
Commenting on the new signing, Xisco Munoz, Watford boss, said, “He is a very good player and I think he would be very good for us.”
Sissoko becomes the 11th first-team signing for Watford this summer, and will be seen competing for a place in the first team side with fellow midfield players Imran Louza, Juraj Kucka, Ozan Tufan and Peter Etebo.
Since the start of this season, Tottenham has won their first two Premier League games, while Watford has one victory and one defeat so far.
Tottenham Hotspur will be playing Watford in the upcoming game. As per Watford’s statement, Sissoko will be available for Sunday’s match against the Spurs.
Sissoko will be seen wearing squad number 19 at Watford.