Assault on Islamic State Syria stronghold 'imminent'
Sipan Hamo, head of the Syrian Kurdish People's Protection Units (YPG) militia, told the London-based al-Hayat newspaper that contacts were underway with the US-led coalition to set "zero hour" for the operation.
The YPG is part of a military alliance including Syrian Arab groups that were airdropped small arms and ammunition by US forces in northeastern Syria on Sunday. The new group is called the Syrian Democratic Forces.
The airdrop is part of a revamped US strategy announced last week to help rebels in Syria battling IS.
In June, the YPG ousted IS from the town of Kobani, which became a symbol of Kurdish resistance. IS's progress in north-eastern Syria has since run out of steam.
The YPG achieved another victory against IS a few days later, evicting it from the town of Tal al-Abyad.
However, there have been accusations the Kurdish forces were engaged in ethnic cleansing against Syrian Arabs.
On Tuesday, Amnesty International said Kurdish security forces have forcibly displaced civilians and demolished houses in several villages in Syria's northeast with no military justification.