The information is all out there and I am not going to repeat all of it as this is so widely previewed. I am sharing my opinion based on facts, and let us have a quick review of team forms in their respective leagues.
With PSG the problem always has been that the league is not competitive enough for them - usually - to prepare well for the big games.
But they struggling also locally, especially now when Mbappe and Messi have been injured, and for sure not fully fit tonight either.
They have a 5 point lead in the table, but performance-wise they have not been any better than Marseille or Lille, and several matches have been decided for their favour by their superb individual attacking trio. After the break, they played 8 games with a 4-1-3 saldo, and most have been especially vulnerable on their travels. The 3-1 loss away at Monaco last round was a very poor performance, for example, shots on target were lost by 9-2, and PSG was never in control of the game. Monaco could have scored even more, but it has to be noted that Messi and Mbappe both missed that game.
The league position in the Bundesliga is a b it misleading as Bayern leads only by one point, but there has been very little wrong in how they play recently, and Union Berlin' season is just an anomaly as in the expected points table - xPts - they are 15 points behind Bayern.
Since returning from the Qatar break Bayern had some starting problems with 3 consecutive draws, but when it matters they seem to be again in full form!

The loss of keeper Manuel Neuer would be a blow if they had not signed even better keeper to replace him. Yann Sommer is superb. Hernandez and Mané are out as well, but Kimmich returns from suspension and Cancelo will be another debutant on the right, and what a classy player he is!
Bayern surely do know how to win Champions league, for PSG it is a dream that will never come true.
本译文使用有道机器翻译,仅供参考:
信息都在那里,我不打算重复所有的,因为这是如此广泛的预览。我以事实为基础分享我的观点,让我们快速回顾一下各自联赛的球队形式。
对于巴黎圣日耳曼来说,问题一直是联赛的竞争力对他们来说不够——通常——为大型比赛做好准备。
但他们在当地也很挣扎,尤其是现在姆巴佩和梅西都受伤了,而且肯定今晚也没有完全康复。
他们在积分榜上领先5分,但就表现而言,他们并没有比马赛或里尔更好,几场比赛都是由他们出色的个人进攻三人组决定的。中场休息后,他们用4-1-3阵型打了8场比赛,大多数人在旅途中都特别脆弱。上一轮客场1 - 3输给摩纳哥的比赛表现非常糟糕,例如,射正球以9-2输掉,巴黎圣日耳曼从未控制住比赛。摩纳哥本可以进更多球,但必须指出的是,梅西和姆巴佩都缺席了那场比赛。
在德甲联赛中,拜仁只领先1分,这是一个误导,但他们最近的表现并没有什么问题,柏林联盟的赛季只是一个异常,因为在预期的积分表中——xPts——他们落后拜仁15分。
从卡塔尔的比赛中回来后,拜仁在连续3场平局中遇到了一些问题,但当关键时刻他们似乎又恢复了状态!
失去门将诺伊尔将是一个打击,如果他们没有签下更好的门将来取代他。Yann Sommer是一流的。埃尔南德斯和Mané也将缺席,但基米希从禁赛中复出,坎塞洛将是另一个在右路首次亮相的球员,他是一个多么出色的球员!
拜仁当然知道如何赢得欧冠冠军,对于巴黎圣日耳曼来说,这是一个永远不会实现的梦想。