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Much like Spain, who derives their talent largely from domestic clubs Real Madrid and Barcelona, Germany gets most of their starting XI from Bayern Munich—one of, if not the largest club in Germany.
Out of today's starting lineup for Germany, seven of them play for Bayern Munich. Thomas Müller was the only Bayern man not to start, but he eventually found his way onto the pitch.
Now, normally, that would constitute a large, beneficial amount of camaraderie, and in the group stages of the tournament, that looked to be true.
But for those of you who don't remember, Bayern Munich's season ended on May 19th with a Champions League final loss to Chelsea. The Euro Cup started on June 8th.
That's only around three weeks off, in theory. The German team then had to fly out to training camp, so realistically it was only about one-and-a-half to two weeks off.
That's not enough time to recuperate for what constitutes the large majority of a starting lineup.
When two-thirds of your team is tired, mistakes will happen. Too many mistakes were made by Germany today, and it ended up costing them.