Players of China acknowledge the crowd after winning the 2018 FIFA World Cup football qualifying match against Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Guo Yong)

Players of China acknowledge the crowd after winning the 2018 FIFA World Cup football qualifying match against Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Guo Yong)

Zheng Zhi of China acknowledges the crowd after winning the 2018 FIFA World Cup football qualifying match against Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Guo Yong)

China's head coach Alain Perrin(R) reacts during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can)

Wu Lei(Top) of China heads the ball to goal during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can)

Yu Dabao (L) of China heads the ball to goal during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can)

Yu Dabao(3rd, L) of China celebrates for goal during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can)

Yu Dabao of China celebrates for a goal during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can)

Yang Xu(R) of China celebrates for a goal during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can) 10

Yu Dabao(R) of China celebrates for a goal during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can) 11

Gao Lin(Top) of China heads the ball during the 2018 FIFA World Cup football qualifying match between China and Bhutan in Thinphu, capital city of Bhutan, on June 16, 2015. China won 6-0. (Xinhua/Cao Can) 12