Iran's envoy to the IAEA Ali-Asghar Soltanieh told Iran's Islamic Republic News Agency he will, however, do his best to brief the board members on Iran's position on the issue.
The IAEA Board of Governors meeting is to continue through Friday.
A spokeswoman for Solana was quoted as saying the meeting would probably take place Thursday.
"For the moment things are moving in the right direction," the spokeswoman said but gave no details. Larijani and Solana already have held two rounds of talks, where Iran said progress was made.
In other developments, U.S. Secretary of State Condoleezza Rice reportedly has indicated a temporary suspension of Iran's nuclear programs could lead to direct U.S.-Iran talks.