Point 1 - Borussia Dortmund's form
Matthias: "The BVB has completely lost form (four defeats, five without a win in the Bundesliga). They concede way too many goals because of individual faults and tactical problems. They've lost their balance, which was visible against Tottenham for the first time this season (in our first Champions League meeting at Wembley). In the offense they lost the creativity and power of the first weeks. Pierre-Emerick Aubameyang has big problems at the moment. He needs too many chances to score and against Stuttgart (BVB's last match on Friday) he was suspended by the club, because he was too late before training."
Below: Peter Bosz
Point 2 - tactics
Matthias: "Normally, Peter Bosz wants to play in a typical Dutch 4-3-3 formation with high pressing lines and much risk. But because of the bad performances during the last weeks it's possible that he changes his formation to a 4-2-3-1 (like against Bayern Munich, 2-1 loss, November 4) or a 3-4-2-1 (like in the second half against Real Madrid, 1-3, September 26)."
Below: Mario Gotze in action for BVB against Stuttgart on Friday
Point 3 - key players
Matthias: "Of course it's Aubameyang. If he finds back his form, he is the key player of Dortmund. Without his goals, Dortmund
has big problems to score. Mario Gotze is also important, he was in a good shape against Stuttgart and it would be very important that Marc Bartra, who struggled against Stuttgart, makes not so many faults like on Friday - especially because Sokratis Papastathopoulos can't play."
Point 4 - Group H
Matthias: "The group was very hard for Dortmund because of Madrid and Tottenham. But we expected a much better performance of Dortmund, especially against APOEL Nicosia. With two wins against them and more luck against Tottenham at Wembley, the situation would be much different now."
Below: Harry Kane wraps up our 3-1 win over BVB at Wembley
Point 5 - Spurs
Matthias: "I think everyone could see that Spurs have a fantastic team with extraordinary players like Kane, Alli and Eriksen, to name just a few, and a very good coach. They are one of the teams who could surprise during this Champions League season -
like Monaco did last year."