Forces to arrive in Afghanistan within days or weeks: US general

Defense Secretary James Mattis has not yet signed any orders to deploy troops.

General Joseph Votel’s comments -- first reported by the Associated Press as the head of U.S. Central Command traveled in Saudi Arabia -- were confirmed by a U.S. official.

But several U.S. officials tell ABC News that those forces will take time to deploy, and that Mattis is still reviewing the exact number of troops that will go to Afghanistan.

Mattis said once he has the Chairman of the Joint Chiefs of Staff's plan for Afghanistan, "I'll look at the number we have on the ground, reorganize those on the ground to align with the new strategy, and bring whatever gap fillers I need."

Additional troops will not go to Afghanistan until Mattis signs formal deployment orders, which has not happened yet, officials said.

They added that while the Joint Staff has identified certain units that might be deployed to Afghanistan, those units have not received formal preparation orders.