After a tepid first half, Tottenham were gifted the lead when Abdoulaye Doucoure scored an own goal in the 53rd minute, deflecting the ball in with his chest.
Pochettino said this was the sort of game that a contender for the league title must win if they are to live up to heightened expectations after the 3-0 win at Old Trafford.
A price of 9/2 was available on a Watford win before kick off with the bookmakers and their victory made them the biggest priced victor in England's top 4 leagues this weekend.
'It is so painful because after Man Utd I was so disappointed with the performance. "It is so painful to concede two goals like this, it is so painful because the first half looked like a friendly game", Pochettino was quoted by Football.London as saying at post-match.
"We are facing many issues, but although disappointing, costly and frustrating, I am uncompromising in my determination to deliver something extraordinary to our fans", Levy said.
Spurs remained in the ascendancy but as the game approached the final quarter, Watford began to build a head of steam and came agonisingly close to an equaliser when Alderweireld headed against his own bar from a Deeney cross. We need to be better.
"If you want to be a contender you can not concede the type of goals we conceded". Today it is good to compare those. We want and expect to win every game and losing is not something we often do, luckily.
"For us I've already seen and said he is very important". I am more than happy to keep all the players and I am more than happy if they leave, and we play with the under-23s.
Three Tottenham players that need to improve after the internationals.
"We conceded a goal and with a very good reaction were able to score two goals from set-pieces". "I think it's obvious that nothing gets us down", Kabasele added. If you want to win you need to show that character, you need to defend well.
"Obviously we defended quite well - but not only the back four - the whole team did well", the centre-back told the club website.