World Bulletin / News Desk
Speaking during a meeting of his Justice and Development (AK) Party in Ankara, Yildirim said the draft would be presented to lawmakers "in the forthcoming days".
"We are almost ready in our preparations on a new constitutional draft," said Yildirim. "We will seek further common ground with opposition parties."
Yildirim said the nation would have "the final say" on a new constitution.
The ruling AK Party has sought to introduce a presidential system to replace the current parliamentary model since Recep Tayyip Erdogan became the first head of state elected by popular vote in August 2014.
In order to secure a referendum, it has reached an agreement with the opposition Nationalist Movement Party to give it the necessary 330 votes in parliament.