Celtic already beaten RB Leipzig in the group phase and know that home advantage can sometimes be half the battle. Since they are much weaker away from home it is clear that they need to have fan support, because they are in for a really tough game in Munich. Bayern didn't manage to be among the eight best teams in the preliminary round recording three defeats which were simply too much in the end. The big problem was that Bayern Munich stumbled whenever they had to play away. The only win they managed was a 5-1 victory against Shakhtar Donetsk and that game took place on German soil. They lost 1-4 at Barcelona and 0-1 against Aston Villa. The trip to Rotterdam was particularly painful because, although Bayern were dominant they ended up empty-handed with a 0-3 defeat. Celtic were extremely strong at home in the preliminary round with 3 wins, one draw and only three conceded goals.