Arsenal need to attack Bayern early if they are to have a chance, with Matthias Sammer identifying the early period in games as the club's weakness.
Yet Arsenal are not giving up on the tie just yet, especially with memories of their win in the Allianz Arena fresh in the memory.
In an interview with BILD, Bayern's sporting director and former Germany international Matthias Sammer has been discussing the one weak point in which the club need to improve.
He's worried about the champions' tendency to start late in games, arguing it's a trend on which they need to improve.
He said: "We are still far away from perfection. Both in Stuttgart, as well as in Nuremberg, as well as at Arsenal we were in the first 15, 20, 25 minutes everything, but not good.
"We must ensure that we are consistent in Hanover and in the future from the first minute. The results are very good. But the initial phase must be better."
So how did they get on at Hannover at the weekend? Well Bayern won 4-0, scoring the first goal in the 25th minute through Thomas Muller, with Mario Mandzukic missing a chance to open the scoring as early as the fifth.
If Sammer was hoping for a faster start compared to midweek he got one, but it could have been better.
Arsenal were on top early on against Bayern at The Emirates, Yaya Sanogo forcing Manuel Neuer into an early save, while Mesut Ozil won and missed a penalty in the opening 10 minutes.
If the Gunners are hoping to get anything when they visit the Allianz Arena in the second leg, the fast start is going to be their best bet of getting a foothold in the game, and this time there can be no margin for error.
12 months ago, Arsenal did strike early at Bayern, Olivier Giroud opening the scoring in the third minute in their impressive 2-0 win.
With Matthias Sammer's concerns that a slow start is a trend for this Pep Guardiola carnation of Bayern Munich, striking early is likely to be their best bet to turn around their first leg deficit.
Bayern have won their last six games by a staggering aggregate scoreline of 22-0, so even the slightest weak point in their normally impenetrable armoury, might just offer a little optimism heading into the return match.
image: © William Brawley