Facing Dortmund at the Westfalenstadion was always going to be a tricky test.
But Tottenham manager Mauricio Pochettino turned a very tough match into a nigh on impossible task with his team selection.
The Spurs boss made seven changes, fielding an incredibly inexperienced team.
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With Tom Carroll, Ryan Mason and Josh Onomah facing the likes of Henrikh Mkhitaryan, Marco Reus and Pierre-Emerick Aubameyang, it left the north London side with very little chance.
And that’s exactly how it turned out with the German side dominating throughout the 90 minutes.
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One goal from Aubameyang and two from Reus meant that Pochettino’s men are all but out of the Europa League
During the thrashing, Twitter was full of people questioning the bizarre line-up from the Argentinian manager.
Of course, Pochettino decided to rotate his squad ahead of their Premier League title race.
His side trail Leicester by five points with just nine matches remaining as they seek their first league title since 1961.
However, as you can see in the tweets above. Many people were confused as to why Pochettino made so many changes considered they face a trip to bottom placed Aston Villa on Sunday.
If Spurs end up winning the title, fans are likely to forget the time that were trounced by Dortmund in the Europa League.
But throwing away the chance to win a major European trophy can be seen as foolish.
Especially as the north London side were dealt their biggest defeat of the season. Some will argue that a heavy defeat, no matter which players were playing, is more costly than a little bit of fatigue.
It will be interesting to see how Spurs approach next week's second-leg.
It's highly unlikely, no matter which 11 players they play, that they will overturn the three goal deficit.
So, will Pochettino resort to making wholesale changes for their home tie?
Fielding a weakened side for the away tie is one thing, but in front of 40,000 at White Hart is another.
But this managerial decision isn't going to turn Spurs supporters against their boss. Pochettino has been a revelation at Tottenham since his arrival in May 2014 and has led his players to an unlikely title charge this campaign.
After the match, Pochettino admitted it was a bad night for his team.
"It is difficult to explain but a bad day and I'm disappointed with our performance," he told BT Sport.
"We did not play well. That is why we lost the game."
He also admitted that it will now be difficult to progress to the quarter-finals but insists they will not give up.
"We need to fight in the return leg next week. Three nil is not a good result for us but we still need to keep working hard and try next Thursday.
"This was our first time losing 3-0 this season. We need to be calm and be sure it doesn't happen again," he added.