The two countries would join Ukraine in pushing for membership after Ukrainian President Volodymyr Zelenskiy urged the EU to expedite Ukraine's membership bid on Tuesday.
He made his appeal to the European Parliament in light of the Russian invasion of his country.
Ukraine's candidacy is to be discussed at an EU leaders summit next week, the senior official confirmed.
The European Commission is now said to be examining Ukraine's application.
EU member states are sceptical however of Ukraine's push for fast-track candidacy status, the EU official said.
Russia's invasion however does create "new parameters," he acknowledged.
Entry to the EU tends to be a lengthy and politically fraught process, during which countries have to align with EU rules and values.
EU member states have the final say on entry applications.
The EU's formal membership candidates are Albania, North Macedonia, Serbia, Montenegro and Turkey.
However, entry talks have stalled or dragged on for years.
Being granted candidate status can provide a country with tangible benefits, for example by making it more attractive for investment, easing trade flows and providing greater stability, according to the EU.
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