Regardless of the result against Ajax, Spurs are now enjoying their most successful UEFA Champions League campaign, with their previous best tournament coming in the 2010/11 campaign, when they reached the quarter-finals.
Tottenham badly missed injured striker Harry Kane and the suspended Son Heung-min and managed only one shot on target.
"Being 1-0 down is hard - Ajax have some incredible young players - but Pochettino will have learned some tactical lessons".
Tottenham: Lloris, Trippier, Sanchez, Alderweireld, Vertonghen, Wanyama, Rose, Eriksen, Dele, Lucas, Llorente.
Donny van de Beek's first-half goal was all that separated the two sides in a tight and sometimes scrappy affair. We help you discover publicly available material and act as a search engine.
The South Korea global, who helped his country to Asian Cup success earlier in the year, has played a tremendous role in replacing the England man when absent, best exemplified during the 4-3 defeat against Manchester City in the quarter-final second leg.
Badly out-possessed most of the night, Mauricio Pochettino's side was better in the second half.
The victor will advance to the June 1 final in Madrid against either Barcelona or Liverpool.
"Sissoko provided the team with good energy and we started to play in the way we wanted to from the beginning".
Although Spurs lost that match, they progress dramatically on the away goals rule, with the platform for their victory laid by the 26-year-old former Hamburg and Bayer Leverkusen man, who scored two first-half goals at the Etihad Stadium, having netted the victor in London a week previous.
While Llorente held his own up front and played to his strengths, the team's dependence on Kane and Son to score the important goals was more than apparent as the game wore on.
Such was Ajax's domination in the early stages that they could already have virtually sealed a place in the final - but they had to be content with Van de Beek's 15th minute goal. We need to change it up a lot for the next game.
"We are alive. It's only 1-0 down".
The Spurs boss previously criticised the "unfair" decision for Eredivisie clubs to have a break while the north Londoners were forced to play a league match ahead of their crunch European tie.
22 years since Ajax last reached the final four, a period of time greater than the age of their captain, Matthijs de Ligt, the visitors were just two steps away from repeating their 1995 success.
The introduction of Moussa Sissoko completely overhauled the Spurs performance, transforming the way they played through his sheer energy and physicality in midfield.