"We had the confidence to keep going", the Belgian said.
The sides will meet again in Germany on March 5 and Pochettino warned Spurs not to take their place in the quarter-finals for granted after a host of dramatic comebacks in the Champions League in recent seasons.
Substitute Llorente applied the icing on the cake for Tottenham three minutes later as he glanced in a header at the near post from a Christian Eriksen corner kick to send the Wembley crowd into a frenzy, sealing Spurs' second-ever knockout stage Champions League win.
Tottenham have been shorn of the influential pair Harry Kane and Dele Alli through injury - winning their last four league games in their absence - and the Belgium global believes their unavailability has helped further the squad's development.
Vertonghen shines as Tottenham cruise past Dortmund 3-0
Wenger, 69, was approached about the role a number of times during his 22-year reign as Gunners boss . We were good in the first half but this is very bitter.
Whenever he has found the net this season, Tottenham have won.
Son has been so vital and his form so consistent that he finds himself touted as a candidate for the player-of-the-year awards.
Son converted Spurs' first shot on target at Wembley on Wednesday as the Bundesliga leaders were made to rue a string of first-half misses.
But Son is much more than that.
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Both those attributes have been essential during a winter slog that has seen Tottenham play 22 matches in 82 days.
"His smile, he translates good energy and his performance in every game is improving. We are so happy with him".
But Son's humble nature means he will not rest on his laurels. A lineup that consisted of a 3-4-1-2 formation, with the biggest questions raised on the left side, where Jan Vertonghen was playing left wing-back. And when the dust had settled on a memorable 3-0 win, nobody felt the elation more than him. I didn't have to do much (for the first goal) because the cross was unreal, the ball went to my foot, I just had to touch it.
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