After a somewhat exhausted start to 2018/19 following his exertions at the World Cup and the Asian Games, it is quite remarkable to see Son stepping up to the mark so regularly, especially in the absence of Harry Kane and Dele Alli. Dortmund surrendered a three-goal lead at home to Hoffenheim, while Spurs ended up with a very flattering 3-1 win over Leicester in a game that they could quite easily have lost.
Alli has been out since mid-January as well after suffering a hamstring injury.
Harry Winks has said Tottenham have shown the rest of Europe they "mean business" in the Champions League after their emphatic victory over Bundesliga leaders Borussia Dortmund. Of course 3-0 is a very good result but when you have in front a team like Dortmund you always need to respect them.
"We were a little bit lucky because when Son scored it was a massive boost to our confidence".
"The first half was very hard, first of all because we never felt the confidence to play", said Pochettino post match.
"The first goal rattled us", Dortmund's Mario Goetze told reporters.
"The first half was very hard".
"There's no doubt in my mind Jadon will get to that level, but for me at the minute, to get one of Dele, Son or Eriksen out now, I'm not sure I could".
"It's not finished, we have to focus on the second game too".
Dortmund were without the services of talisman Marco Reus as Chelsea-bound Christian Pulisic was drafted into the attack.
Son opened the scoring in the second half and proved a menace for the Germans' defence.
Suddenly, Dortmund had no answers to Tottenham's high-tempo pressing and it was Vertonghen who was the hosts' unlikely hero in the 83rd minute as he volleyed home from Serge Aurier's cross.
Pochettino has not been afraid to give young players an opportunity at Spurs, with 18-year-old Oliver Skipp, on the bench last night, the latest to graduate to the first team.