Tottenham's Premier League title challenge hit the buffers on Friday night when they lost 1-0 at West Ham.
But Manuel Lanzini's second-half goal left Tottenham's title hopes in tatters as Chelsea will now clinch the title if they win two of their last four games.
Significantly, the win leaves Spurs four points off Chelsea, who have a game in hand and can win the league before Tottenham kick a ball again. "Today was a key moment, we had to show that when you do not play well but when you must win, you win". There are games you must win, it's not about playing good or bad, or running more or less. They had nine wins in a row, you have to play really well.
"We started the second half a little bit sloppy, we conceded in the space and the way we conceded the goal in this type of football, when you are fighting for the big things, you feel disappointed, " Pochettino said.
"When you lose, OK maybe it's because of the pressure. We have to wait but are thinking that it will be hard to catch Chelsea", said Pochettino.
Tottenham fans produced a brilliant gesture to former winger and Everton player Aaron Lennon during their game against West Ham.
What has proved costly for Tottenham are the dropped points in the opening months of the season.
Eric Dier knows Tottenham must quickly put their title disappointment behind them to avoid a repeat of last season's capitulation. "I said beforehand we needed to be 100 per cent and that's what we got", skipper Mark Noble said.
For all the talk of its lack of atmosphere, as Lanzini smashed home the second-half victor a roar went up like nothing heard at this venue since Mo Farah came down the final straight in 2012.
He now faces the hard task of raising his players for the next game, the little matter of the visit of Manchester United, and the last fixture to be hosted by White Hart Lane prior to its redevelopment.
"We didn't put in the right energy, especially because of the context - it's a derby and even more because it was a game which was very important in the title race. It was not enough".
The result in east London means Chelsea need just six more points to guarantee they will lift the Premier League for the second time in three years.