Heather Higginbottom, US deputy secretary of state for management and resources, said this brings Washington's total commitment to Europe's migration crisis to USD 43.6 million since last year.
Most of the funds -- USD 17.5 million -- will be given to the UN refugee agency, Higginbottom said during a visit to Lesbos, the island that has experienced most of the refugee arrivals registered in Greece since 2015, where there are over 2000 refugees and migrants according to the Greek government.
Dozens of migrants awaiting repatriation from Greece held a protest today at the registration hotspot of Moria prior to the US official's visit.
Standing behind wire fencing and under sizeable police guard, the migrants shouted "Freedom" and "Where are human rights?".
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"Syrians and Iraqis are angry, they are saying that they did not come all this way to be deported," said Nolan Hussein, a 20-year-old from Pakistan.
"They have no information, only a piece of paper saying they are under detention," said Hussein, adding that owing to overcrowding at the camp, he shares a room with nine people.
Arrivals fell this week, and Greek authorities have used the relative calm to put in place logistics to send people back to Turkey, including the deployment of 4,000 security personnel and asylum experts.
All new arrivals in Greece are being taken to registration centres set up on five Aegean islands. Those seeking asylum will stay there while their applications are considered by Greek and European officials.
Greece's police minister Nikos Toskas denied Monday that there were 50,000 people "trapped" in the country due to the closure of Balkan borders further north.