"The first half was tough, it was an even game but after Sonny scored the team started to feel more free, more confident and started to play in a very good way".
Here are the player ratings for the Borussia Dortmund players from the game. It was a fantastic game, a massive effort. They deserve a lot of praise for the effort they are doing this season.
Dortmund's U.S. midfielder Christian Pulisic (left) and Tottenham Hotspur's Ivorian defender Serge Aurier battle for the ball during the Uefa Champions League first leg match at Wembley Stadium on Wednesday night.
Pochettino also warned that, despite the fact they will take a 3-0 lead to Dortmund on March 5, Tottenham can not take their progression for granted.
"Harry or Dele are very important for us but we have players who can come in and do well. When you have a team in front of you like Dortmund you need to respect them", Pochettino said.
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"Today it's 3-0 and maybe everyone says, "Oh, fantastic decision", or maybe if it's a different result I'm the worst coach in the world", he said. That was a gift.
Lloris made a superb save to deny Dortmund on the stroke of half-time as Dan-Axel Zagadou met Sancho's cross with a header that the Tottenham captain clawed out at full stretch.
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.
While Borussia Dortmund had the better of the opening 45 minutes, the second period was dominated by the Premier League side, whose pressing resulted in Jan Vertonghen gaining possession, before producing a stunning cross that Son Heung-min duly converted.