Nipples in Moscow
The situations domestically might play a role in some of these duels.
For example, Wolfsburg more or less has the CL secured for next year via the Bundesliga. They are +12 from the 4th placed Schalke (3 spots lead to direct CLq in Germany), so their participation in the CL next year is a given. This means that the EL isn't their ticket to the CL. On the other hand, they are 8 pts behind Bayern. Depending on the situation before 12th of March, when they face Inter, Wolfsburg might actually sacrifice EL if they are fighting with Bayern for the Bundesliga. On the other hand, if Bayern makes an even bigger difference in the BL, then the EL will be the only remaining thing to play for Wolfsburg.
But this is an exception, because for the majority of these teams the EL is the most important thing remaining this season, so I expect them to give 100% here. Good thing for the rest is that the Spaniards play each other. Those guys are always top favorites in this competition, but after this round only one of them will remain.