The president said that Idlib is the key to ending the country's eight-year civil war.
"The battle of Idlib is the basis for resolving chaos and terrorism in all other areas of Syria," the president's office quoted the president on its social media networks.
Turkey's President Recep Tayyip Erdogan backs the rebels who fought to topple Assad during Syria's eight-year civil war. But Assad's allies, Russia and Iran, have helped turn the conflict around, as U.S. forces are now withdrawing from northeast Syria.
Erdogan and Russian President Vladimir Putin will meet in the Black Sea resort of Sochi on Tuesday for talks which are likely to shape the next steps in northeast Syria.