Lt Gen Stephen Townsend, the top US commander in Iraq, said he sees the Iraqi assault on the IS-held area of Tal Afar "unfolding relatively soon."
The upcoming fight follows weeks of Iraq regrouping troops and repairing equipment and weapons after recapturing Mosul in July.
"I can't say that we replaced every single damaged or broken vehicle or rifle or machine gun," said Townsend, whose forces are aiding the Iraqi military. But, he insisted: "They'll be ready enough."
Mosul took a heavy toll on Iraqi forces. As many as 1,400 troops were killed and more than 7,000 wounded, and the Iraqi military has proceeded methodically since its biggest success to date. Just three years ago, its soldiers were chased by the Islamic state group from much of the battlefield.
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"In the end, it took bulldozers plowing ISIS fighters under the rubble," he recalled, using multiple different acronyms for the extremist group. "Iraqi infantry men advanced beside the bulldozers, shooting and throwing grenades at Daesh fighters popping up out of the rubble."
Iraiqi Humvees emerged shot up, their glass spider-webbed with bullet marks and shrapnel, their weapons worn out or even destroyed.
In the weeks since, much of the Iraqis' equipment has been repaired or replaced, said Gen. Joseph Votel, America's top Middle East commander who spent the last few days in Iraq.
Votel met with Iraqi military and political leaders in Baghdad and with Kurdish Peshmerga leaders in Irbil, in northern Iraq. He was ensuring US military advisory teams are with the right local units to provide the best support, intelligence gathering, surveillance and advice.
Iraqi military leaders said Prime Minister Haider al- Abadi has approved their combat plans. The fight will involve a broad spectrum of forces, including the Iraqi Army, counterterrorism troops, police and a group of mainly Shiite, Iranian-backed militias.
Rasool said the various Iraqi forces already have largely encircled Tal Afar.
"I don't think it will be tougher than the battle of Mosul, taking into consideration the experience we got in Mosul," he said.