Merkel will meet with Prime Minister Ahmet Davutoglu on Monday to discuss "the further implementation of the EU-Turkey action plan" agreed in November to reduce the number of asylum seekers arriving in the bloc.
They will discuss aspects of the plan that have not yet been implemented and "how we can make progress on reducing illegal migration and replacing it with legal migration," spokesman Steffen Seibert said.
He said Berlin was still particularly concerned about the rampant people smuggling off the Turkish coast where dozens of refugees have drowned in recent weeks.
Under the November deal, Ankara had agreed to lower the number of migrants coming through, but between 2,000 and 3,000 people are still arriving daily in Greece from Turkey.
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The EU on Wednesday finally reached agreement on how to finance a three-billion-euro (USD 3.3-billion) deal to aid Syrian refugees in Turkey, in exchange for Ankara's help stemming the flow of migrants.
Merkel has come under massive political pressure to set a refugee quota, but has so far resisted despite the arrival of nearly 1.1 million asylum seekers arrived in Germany in 2015.
She has instead promised a "tangible reduction" in new arrivals, and is counting on international efforts to deliver.