Bayern Munich go into their second leg against Basel trailing 1-0, and they will be extra motivated because the final is at their Allianz Arena home.
However, they should watch out for Basel, who have already shown this season that they can cause an upset.
They were trailing to Manchester United at Old Trafford, and came back to get a result.
Basel have real know-how, intelligent players and they have built a great structure at the club.
Their coach Heiko Vogel used to be Bayern's assistant manager, but that shouldn't be an excuse for the German side if they do not get through.
When the final is at your home stadium, you have to succeed, but they have shown defensive weakness - Basel hit the crossbar and post, and could have scored more in the first leg.
Chelsea need to win 2-0 or better to go through in their tie against Napoli, so they have to make it an open game.
They need to take risks without conceding goals, which is a tough task because Napoli are so good on the counter-attack.
They are a strong team, very efficient in the final 30 metres, and they give the impression that they can score at any time.
Their goals-to-shots ratio is extraordinarily good, and that's not just down to the great shooting of Edinson Cavani and his team-mates.
It means they are creating clear chances, and the ability consistently to fashion goalscoring opportunities is the sign of a great team.
Like Arsenal, Chelsea have had a turbulent season. They now have a new coach and Roberto Di Matteo has not had much time to impose his ideas or restore confidence, which is another problem.
However, I still think they can qualify, and Napoli may live to regret not scoring a fourth goal in the first leg that may well have put the tie out of reach.