It all comes down to this: Tottenham Hotspur's season rests on their tie against Eintracht Frankfurt.
Ange Postecoglou's side have endured a torrid Premier League campaign, and with them out of the FA Cup, the manager's record of winning silverware in his second season relies on them winning the Europa League.
It would be fair to say then that tonight's game is the most important game in the Australian's tenure at the club, so he has to get his selection and tactics spot on, as the German outfit are no pushovers.
Therefore, while it might sound harsh and maybe even a little counterintuitive, he must take Son Heung-min out of the starting lineup.
Why Son has to be dropped
So, before people start throwing things, we recognise that on ability alone, Son is one of the better players in the Spurs squad, but unfortunately, that alone is not enough in a game like this.
Frankfurt are going to come flying out of the blocks tonight, and while it's not his fault, the South Korean superstar is not the rapid and incredibly dynamic winger he once was.
It's a simple fact of life that, at 32 years old, he isn't able to play games with the same level of intensity that he once did, with research from The Athletic pointing out that wide players peak at 26 and become significantly less effective at beating their full-back once they hit 30.
Moreover, the former Bayer Leverkusen star hasn't even been producing much either, as he's scored just one goal in his last ten league appearances and failed to add to his tally in the Round of 16 tie against AZ Alkmaar.
Finally, according to FBref, he's in the bottom 44% of attacking midfielders and wingers for successful take-ons in the Premier League this season, which is not what you want from your left-winger ahead of a must-win European knockout tie.
The good news is that there is someone who could step in for Son, someone with recent experience of playing in Germany.
The Spurs star who should start ahead of Son
While some might call for Mikey Moore to start on the left tonight, we reckon the player to come in for Son should be Mathys Tel.
Now, we know the Frenchman hasn't exactly lit the world alight since moving to North London in the winter window, but he has shown glimpses of quality here and there, such as his consolation goal away to Aston Villa in the FA Cup.
However, that's not really relevant, as the main reason he should be in from the word go tonight is that, based on his performances last season, he's capable of bringing an abundance of energy and dynamism to the left-hand side, and in turn likely force Frankfurt to at least be more cautious of quick breaks and counter-attacks.
For example, FBref placed him in the top 9% of attacking midfielders and wingers in the Bundesliga for successful take-ons last season, with an average of 3.17 per 90.
Moreover, when the "mind-blowing" prospect, as dubbed by talent scout Jacek Kulig, was given game time, he was simply sensational, scoring ten goals and providing six assists in just 1406 minutes across 41 appearances.
That means the explosive attacker averaged a goal involvement every 2.56 games, or more impressively, every 87.87 minutes.
Finally, it would also be a brilliant idea to play Tel for the first 65 minutes or so, have him run the defence ragged, and then bring Son on, who might be able to find more space and punish them with his still impressive finishing.
Ultimately, Spurs need to win this tie to save their season, and the best way of doing that is by playing with intensity and dynamism, which is something the Frenchman has in spades.