Chelsea must win on Wednesday, and Juventus must lose to FC Shakhtar Donetsk, or the Blues will miss qualification for Champions League's Round of 16 for the first time in their last 10 UEFA campaigns.
That's a big deal. Because it's not entirely in the hands of Rafael Benitez's squad, it's even more intimidating.
Chelsea should have no problem holding up its end of the bargain. The Blues defeated the Wild Tigers 4-0 the last time they met, and the result should be no different considering that Chelsea has so much on the line.
Blues fans don't want to miss this one. If you can't catch it on television, watching the live stream is your next best option.
Where: Stamford Bridge, London
When: Wednesday, December 5 at 2:35 p.m. ET
Live Stream: Fox Soccer 2Go
Chelsea's Player to Watch: Juan Mata
Mata scored two goals the last time these two squads met, leading his club's rout and showing his dazzling ability from the outside.
Chelsea is very strong up the middle, but Mata and Victor Moses don't always provide firepower from the perimeter. If last meeting is any indication, that won't be the case for Juan Mata this time around.
When Mata is on, he spreads the entire defense. This allows the Blues' offense to attack from all angles and puts more pressure on the opposing team's defense.
He's more comfortable when passing the ball, but he showed that he's a capable goal-scorer in Champions League action when his squad played FC Nordsjaelland the last time.
If he can repeat that performance, his team will be in good shape once again.
FC Nordsjaelland Player to Watch: Joshua John
The Wild Tigers need some offense versus Chelsea this time. Losing 4-0 to a stronger squad is somewhat anticipated, but it still doesn't make it feel any better.
John is the key to changing that. The 24-year-old striker is talented, but he hasn't broken out on the UEFA stage. He has one assist, but that's not going to cut it this time around.
Chelsea can be had defensively, but it's going to take expert skill in the offensive third. John is an underrated player with the ball at his feet, and he's not afraid to take risks once he's in deep.
The Wild Tigers aren't going to win this game by playing tentatively. Chances must be taken, and John is the best guy for the job. He's going to need to sneak through Chelsea's defense, create a goal-scoring opportunity and hope it pans out if his team wants to pull the upset.