"If everything is in order… it will take time but then we will see," Pouyanne said, noting Iran is sitting on the world's second largest gas reserves and also has huge oil resources.

"One issue is how the sanctions will be lifted and at what pace. The entry of any company into Iran would depend on the way the sanctions would be lifted… we are respecting the sanctions regime," Pouyanne told reporters at a press conference at WGC 2015.

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