Iran's Oil Ministry denied state media reports on the Islamic state stopping its crude exports to six European countries on Wednesday.
"We deny this report ... If such a decision is made, it will be announced by Iran's Supreme National Security Council," a spokesman for the ministry told Reuters.
Iran's English language Press TV had earlier said Iran has stopped exporting oil to France, Portugal, Italy, Greece, Netherlands and Spain.
The European Union's 27 member states have decided to stop importing crude from Iran from July 1 over its disputed nuclear program, which the West says is aimed at building bombs. Iran denies this.