"The Raqqa isolation phase will be completed within the next few weeks," Dorian stated on Wednesday.
"Once Raqqa is isolated, Islamic State [Daesh] will not be able to reinforce fighters in Raqqa and those in the city will not be able to get out," Dorrian explained.
The Turkish military has not yet participated in the offensive to liberate the Syrian city of Raqqa from Daesh, Dorrian said.
"They have not [participated] so far. They have been focused on Al Bab and other areas."
Operation Wrath of Euphrates aiming to recapture Raqqa from Daesh was launched on November 5, 2016. The second stage of the operation led by the Syrian Democratic Forces (SDF) started on December 10.
Daesh captured Raqqa in January 2014 and the city has served as its center of operations since.