Alex Iwobi (R) of Nigeria vies with Ari Skulason of Iceland during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. Nigeria won 2-0. (Xinhua/Lui Siu Wai)

Ahmed Musa (L) of Nigeria celebrates his scoring during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. Nigeria won 2-0. (Xinhua/Lui Siu Wai)

Iceland's goalkeeper Hannes Halldorsson (R bottom) defends during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. Nigeria won 2-0. (Xinhua/Lui Siu Wai)

Ahmed Musa (C) of Nigeria celebrates his scoring during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. (Xinhua/Lui Siu Wai)

Ahmed Musa (C) of Nigeria celebrates his scoring during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. (Xinhua/Lui Siu Wai)

Alfred Finnbogason (C) of Iceland shoots during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. (Xinhua/Lui Siu Wai)

Ahmed Musa (front) of Nigeria celebrates his scoring during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. (Xinhua/Lui Siu Wai)

Gylfi Sigurdsson (R) of Iceland vies with John Obi Mikel of Nigeria during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. (Xinhua/Lui Siu Wai)

Wilfred Ndidi (top) of Nigeria competes for a header during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. (Xinhua/He Canling)

Gylfi Sigurdsson (R) of Iceland vies with Leon Balogun of Nigeria during the 2018 FIFA World Cup Group D match between Nigeria and Iceland in Volgograd, Russia, June 22, 2018. (Xinhua/He Canling)