"Mr ElBaradei's trip is on the agenda and its definite date will be decided when the two sides agree," foreign ministry spokesman Mohammad Ali Hosseini told Iranian state media.

Diplomats in Vienna, where the International Atomic Energy Agency is based, said earlier that ElBaradei had wanted to visit Tehran ahead of the publication of his report, but that the Iranians felt the time was not right.

"Currently, we are in the process of defining a situation for this meeting and his visit to Iran. The invitation for Mr ElBaradei is still on," Iran's ambassador to the IAEA, Ali Asghar Soltanieh, told state media.

The IAEA report, which could be released on Wednesday or Thursday, will determine whether Iran is cooperating with an investigation into its disputed nuclear activities.