Germany lost to Mexico 1-0 in their first match of the tournament at the Luzhniki Stadium in Moscow on Sunday.

"We left too much free space for our opponents. We had the same problem in last matches, we talked a lot about it and tried to fix it, but, as you can see, we failed to do that. Now we have no choice but to win the next group-stage matches," Muller told journalist.

Germany will face Sweden on Saturday and will play their final group game against South Korea on June 27.