Afghani forces left the strategically crucial districts of Musa Qala and Nawzad five days ago, allowing the militants to take control of the area, Xinhua reported, quoting reports by local media.
"We have withdrawn our forces from Nawzad and Musa Qala based on military plans," said Mohammad Rasoul Zazai, a spokesman for the 215th army Corps.
Merza Khan Rahimi, the governor of Helmand, praised the step as well, explaining that "it is normal during fighting to move forward or retreat.” He added that abandoned districts could be reclaimed by the state army at any time.
Official US statistics are less optimistic. Almost a third of the country, ravaged by the long-term conflict, may find itself in the hands of the Taliban again.
After an international military coalition left Afghanistan in 2014, state forces gradually lost control of Helmand, encouraging the Taliban in its continuing offensive.
The militant group seeks to oust all Western-backed entities, re-establishing Islamic rule in the country.