The England international came on as a late substitute.
Two goals from Marco Reus after Pierre-Emerick Aubameyang had given them the lead secured Dortmund their commanding first-leg victory.
But the team selection from Mauricio Pochettino had many in shock. He left the likes of Harry Kane, Mousa Dembele and Eric Dier out of proceedings - with one eye on the Premier League.
Kane ended up coming on late in search of an away goal, to no avail.
It begged the question, why take Kane to Germany at all?
Former Manchester City and Leicester City striker Paul Dickov was in the Sky Sports News HQ studio today (11/03/2016) and he was asked whether Kane would have gained anything from the game.
He believes the England striker's presence was still needed:
"I think what Pochettino is trying to do is one, keep the other members of his squad happy that aren't playing every week.
"But Harry he is a captain as well. He will have a big influence on the team spirit that they have this year in the Premier League on the pitch translates off the pitch as well.
"As much as Harry wasn't starting they were all out there and together as a group, getting away for two-three days.
"I think they still got a big benefit. Harry himself probably would have wanted to play the 90 minutes going out there. But in the changing room having that squad togetherness is a big thing."
Dickov certainly has a point in terms of team camaraderie. Kane is one of the more standout figures in the Spurs dressing room and he would have been a big voice in the group.
Pochettino also wants his Spurs starts tight-knit, which they are, in order to continue their fight for the Premier League title.
This humbling experience may have not been enjoyable for the fans. But it might have even brought the Tottenham players closer together - ahead of a Premier League title assault.