Nigeria coach Stephen Keshi has insisted that boss Carlos Queiroz could be Iran's "biggest weapon" ahead of their fixture in Group F.
The two teams get their World Cup campaign underway in Curitiba on Monday evening, but after previously revealing that he is not too familiar with Iran's squad, Keshi has admitted that he fears the impact his counterpart could have on the minnows.
The 52-year-old is quoted by FIFA.com as saying: "I think that their coach is their biggest weapon, because he's well experienced, he knows the game well."
The first game in Group F saw Argentina record a 2-1 victory over Bosnia-Herzegovina on Sunday evening.
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Netherlands
Senegal
Ecuador
Qatar
England
USA
Iran
Wales
Argentina
Poland
Mexico
Saudi Arabia
France
Australia
Tunisia
Denmark
Japan
Spain
Germany
Costa Rica
Morocco
Croatia
Belgium
Canada
Brazil
Switzerland
Cameroon
Serbia
Portugal
South Korea
Uruguay
Ghana
