Spurs played out the remainder of the match easily, even giving Harry Kane some minutes from the bench following his early return from an ankle injury.
Earlier this week Chelsea manager Antonio Conte said while there was an "expectation" at his club they would be title-contenders, it would "not be a disaster" for Tottenham if they yet again missed out on lifting the Premier League trophy.
'Harry's had a few sessions before, and today he was involved with the team, ' Pochettino said.
"If you don't show a strong mentality in 24, 25 players then you will not be able to rotate and give opportunities to others and they don't feel like an important part of the project, then it is so hard to win titles". "I haven't decided yet if he'll be in the starting eleven or on the bench but the good thing is that he's back". "The good news is he's ready". That's one of my main attributes and I try to do my best and get into those positions where I can feed them into the strikers and try to create as many goals as I can. Spurs have done very well in the absence of their star striker, but they'll be even better with him back in the side.
"You start to realise that football is a collective matter and one man is not important. His character is unbelievable".
Pochettino insisted he also has no fears over the potential debut of third-choice goalkeeper Pau Lopez.
Spurs fans were quick to point out the apparent gaffe.
Spurs have been Chelsea's closest challengers for the Premier League title this season, with Spurs now second in the table and seven points behind the leaders.More news: Fresno gunman laughed as he explained his actions
They can also equal their top-flight record of 11 straight home wins in a single season, set in 1922.
"We must make an effort to win matches and be prepared if Chelsea neglect".
Second-from-bottom Middlesbrough's hopes of beating the drop are slipping away though after they could only draw 0-0 at home to Burnley - stretching their winless run to 14 league games. "It is a massive result for us", Pochettino told BBC Sport.
"Obviously I need to play well to try to keep the spot". "And we showed character against Swansea".
"But it's true that after eight games if they don't win the Premier League, it will be tough for them to accept".
While Trippier has found starts hard to come by at Tottenham, he always impresses against Watford.
"But anything can happen because there are 24 points (to play for) and other rivals can provide surprises in the title race".