Mission chiefs of Greece's international lenders will briefly visit the country on Oct. 20 to be informed about the pace of reforms following approval of key legislation last week, a Greek government official said.

"We are expecting them tomorrow, they will stay for two or three days. It will be a short briefing about the reforms, they will return (for the review)," the official told Reuters.

Greece's parliament last week approved a first raft of reforms to its pension and tax systems, sought by lenders as a condition for up to 86 billion euros in aid.

"The key issue that will be examined during the review will be the pension reform. Of course there are other issues as well, but pensions will be in focus", the official said.

The review, which had been due to start mid-October, was pushed back because of parliamentary elections in Greece on Sept. 20. It is unclear when the review will commence.

Athens wants to conclude the review and recapitalize its banks by the end of the year. Lenders in the country have been depleted by a capital flight and a mountain of non-performing loans.