In the centrepiece of the Champions League second leg, Bayern take on Barcelona at home. Julian Nagelsmann's side have made an excellent start to the Bundesliga. Bayern have played to perfection and crushed all their opponents, but the situation has changed dramatically in recent matches. Three draws in a span of four games. The team had global difficulties with the realization of chances. Bayern have also stopped coping easily with their opponents' positional defence. The club consistently lost points in matches against modest Union and Stuttgart. The latter encounter could not be won at all on home soil. After a perfect start, Sadio Mane's performance dropped drastically. The loss of Robert Lewandowski also took its toll. At the same time, Nagelsmann's side made a good start to the Champions League. The Germans managed to beat Inter 2-0 away. There are no big number of injuries. Only Kingsley Coman is out of the starting line-up. The attacking group remains full. Barcelona entertained in another match at the weekend. The Catalans defeated Cadiz away. In doing so, Xavi still allowed for a rotation. The coach released Robert Lewandowski only in the second half, but he still extended his scoring streak. Barcelona have looked very solid in the opening games of the season. So far, the Catalans have had an enviable streak of not just wins, but crushing victories. The Catalans have won five games in a row by big scores. The start to the Champions League was also ideal. The Czech champion Viktoria got the better of Barcelona. The Catalan club's big trump card is rotation. At the moment, Xavi has almost two equivalent squads at his disposal. Barcelona have one of the deepest squads in Europe. In Munich, bookmakers have Bayern as the clear favourite, but there are questions about the status of the home side. Past head-to-head matches do not give an objective picture. Back then, Barcelona played with a very young squad. The level of the players was completely different. In the current situation, Barcelona have already been tested by quality opponents. The club defeated Sevilla and Real Sociedad. In other words, Xavi's system is working. The Catalans will have a real chance in Munich. The Lewandowski factor could play a key role. Robert will have special motivation for his former club. Bayern's defence looks the weak point. If Nagelsmann dares to play the attack through high pressing, the hosts could have global difficulties, given the speedy qualities of Dembele and Rafinha. A defeat by the home side is unlikely.