Clinton is also meeting with Turkish President Abdullah Gul and Foreign Minister Ahmet Davutoglu, the sources said.
Her visit comes as ongoing violent clashes between government forces and Sunni insurgents, which Turkey supports, are causing a rising exodus of refugees from Aleppo across the border into Turkey. Turkey accuses Syria of aiding Kurdish PKK rebels, whose offensive in Turkish Kurdistan has left 150 dead since July.
In an effort to stem the power of the PKK, Turkish authorities have readied a plan for military intervention in the Kurdish-majority north, creating a 20-kilometer buffer zone along the border with Syria, Turkish Cumhuriyet wrote on Friday.
This plan could be on the agenda at the meeting with Clinton, Cumhuriyet speculated.
Following the downing in June of a Turkish Air Force jet off the coast of Syria, Erdogan allegedly called US President Barack Obama to propose a joint military intervention in Syria under US leadership but was refused, according to Israeli website Debka, which covers terrorism and espionage. However Obama is expected to announce new sanctions against Syria, according to US official sources. (ANSAMed).