US Secretary of State Antony Blinken talked with Finland's foreign minister, the official said.
The prospect of Finland and Sweden joining NATO was part of the discussion during a meeting of foreign ministers from the military alliance in Brussels this week, a senior US State Department official said.
The official added that such a decision would be up to Sweden and Finland.
US Secretary of State Antony Blinken had a short conversation with Finland's foreign minister, the official said.