"We should have got the ball forward rather than played from the back for their first goal".
Dortmund were on top during the opening 45 minutes but conceded just two minutes after the restart when Heung-Min Son volleyed in and Jan Vertonghen and Fernando Llorente added two late goals.
The Bundesliga leaders, who were eliminated from the German Cup last week, were nowhere to be seen in the second half, with speedy teenager Jadon Sancho given no space to operate after the break.
"Next time Son scores I will go to the dressing room, have a shower and wait for the game to finish", he joked to the media.
Pochettino's side had been under the cosh as Dortmund dominated the first half at Wembley, but Hugo Lloris kept them level with a series of fine saves.
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'He is a player who provides the team with a lot of very good things. And while Lucas Moura couldn't reward the hosts at the beginning of the first-half, Son Heung-min was able to two minutes after the restart. It was an wonderful result and the players deserve massive praise but we need to think that it's going to be tough to play over there. 'My players are heroes.
'For me, it is only the first leg, it is only the first half of the tie'.
Pochettino devised a clever game-plan that eventually frustrated Dortmund and secured Tottenham's first ever Champions League knockout-round win at home.
It was just the second time in Vertonghen's Tottenham stay that he had registered a goal and an assist in the same match, and team-mate Son heaped praise on the talented defender before warning that the round of 16 tie wasn't done and dusted.
Working as a pundit for beIN sport, the ex-Gunners boss said: "I wanted to take him from Man City when he didn't get a game".
Yet Skomina called for a VAR check and after a number of replays, ruled that Tadic had been standing in an offside position when the goal was scored.