Spurs overcame a poor first-half display at Wembley to put one foot in the quarter-finals with a scintillating second-half performance that Vertonghen was at the forefront of.
"The first half was very hard, first of all because we never felt the confidence to play", said Pochettino post match. "We have watched games back from the past where we have lost and we have taken a lot on board". It's like we weren't comfortable.
"Also we were a bit lucky because it was a massive confidence boost when Sonny scored - it made the team play much better".
The first half of the first-leg, round-of-16 match at Wembley Stadium was scoreless as Dortmund put heavy pressure on Tottenham, but Son broke the deadlock just two minutes into the second half, striking the ball past goalkeeper Roman Bürki after collecting a flawless cross from Jan Vertonghen. We deserved the victory in the end. They were fantastic. To play after Sunday, with one day less recovery [than Dortmund], we need to praise them.
There is a misleading perception of Son as a dutiful but low-key character content to play in the shadows of his more famous Tottenham teammates.
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The France global had to be at his acrobatic best in the closing minutes of the half as Dan-Axel Zagadou rose to meet Jadon Sancho's cross, the goalkeeper clawing the ball away at full stretch. "The first half was hard".
Vertonghen, playing out of position at left wing-back, then scored a volley of his own from Serge Aurier's delivery.
Tottenham are set to reward Heung-Min Son for his excellent recent form with a lucrative new contract in the summer.
It was an incredible thrill for him, being up close to Cristiano Ronaldo and all of the rest, but not least because first and foremost Winks is a Spurs fan who started going to home games with his father, Gary, when he was six or seven.
There were many star performers in a Spurs shirt against the side leading the way in the Bundesliga, but defensive lynchpin Vertonghen shone brighter than anyone. "It's good to play against great competition in any league, but I'm definitely looking forward to next season".