Thomas Mueller of Germany attends a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Li Ming)

Coaching assistant Miroslav Klose (1st R) of Germany attends a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Li Ming)

Germany's head coach Joachim Loew (front) attends a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Lu Jinbo)

Germany's head coach Joachim Loew attends a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Lu Jinbo)

Germany's head coach Joachim Loew (R) attends a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Lu Jinbo)

Players of Germany attend a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Li Ming)

Thomas Mueller (3rd R) of Germany attends a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Lu Jinbo)

Thomas Mueller (1st L) of Germany attends a training session prior to the 2018 FIFA World Cup Group F match between Germany and Sweden in Sochi, Russia, on June 22, 2018. (Xinhua/Lu Jinbo)