Spurs will play in the last eight for the first time since 2011 after winning 1-0 in Dortmund to clinch a 4-0 aggregate victory. "We can build on the first-half performance but we need to score goals,".
His goal on Tuesday also made him Tottenham's all-time leading scorer in Europe.
Spurs sat just six points behind their big spending title rivals but last week's slip-ups have left them in a battle for a top four spot, leaving some fans frustrated that they have yet again hit their ceiling, falling short of a serious title challenge and are stuck in a repetitive cycle.
"It was fantastic, job done", Pochettino added.
Madrid, who were missing inspirational captain Sergio Ramos through suspension and hit the woodwork twice in the first half, came out stronger after the interval but were dealt a fatal blow when Serbia worldwide Tadic crowned his sensational display by hammering into the top corner in the 62nd minute.
Kane's strike destroyed Dortmund's hopes of a comeback.
UK Brexit talks failed to reach deal on Tuesday
Another 600 million pounds will be available through a bidding process to communities in any part of the country. A spokeswoman for the prime minister said: "We are working at pace to secure the changes we need".
Tottenham are locked in another race against the clock to open their new stadium in time for a Champions League quarter final and Toby Alderweireld admits it would provide the players with a huge boost to be back at White Hart Lane. Now we're in the quarter-finals I hope we can finish and can listen to the song there.
"I was talking yesterday with Daniel [Levy, the Spurs chairman] and he was very positive", Pochettino said. We need to take the positive things out of this game for the Bundesliga.
"After the first leg result, you could see the risks Dortmund took".
"We knew it would be really hard because of the loss in the first leg. Tottenham waited for their chance and with Harry Kane up front you can do that", he said.
That was a view echoed by Mario Gotze, who said: "When you saw how we approached the first half and how much energy there was in the stadium, that was very, very, very good, at a very high level".
Dortmund flew out of the traps, pounding the Spurs defence with 10 attempts in the first half alone, restricting the Londoners to a single Son Heung-min effort, and enjoying 70 percent possession.