Xabi Alonso has become a very special manager for Leverkusen fans already. It is easily visible. It was such a cool thing to see Xabi Alonso lifting the trophy with the fans at the stadium. He climbed to the tribune to do that. 
He is about to break every record available as it seems. First of all, he started with making Leverkusen the first ever undefeated champion in the Bundesliga history. Now he is going for finishing the season with 3 titles by not losing any game as well. This must also be some kind of a record. I don't believe there is any better achievement earned than this by another team so far. I don't remember any manager who started their career this spectacular.
He is about to break every record available as it seems. First of all, he started with making Leverkusen the first ever undefeated champion in the Bundesliga history. Now he is going for finishing the season with 3 titles by not losing any game as well. This must also be some kind of a record. I don't believe there is any better achievement earned than this by another team so far. I don't remember any manager who started their career this spectacular.
I don't know if there is a team that has won 3 trophies without defeat, but I can say that there are very few teams that have won the league championship without defeat. Already Milan did it in the 91/92 season, Arsenal in the 02/03 season, and Juventus in the 11/12 season. Now Bayer Leverkusen has done it. Xabi Alonso won the league title without defeat and made history with his team. Now they have the UEFA Europa League ahead of them, but Atalanta will not be an easy opponent for them. I will be looking forward to watching this match in 2 days.