The Pentagon on Friday denied a report by the Associated Press that Defense Secretary Jim Mattis has decided to send 4,000 additional U.S. troops to Afghanistan.

"Secretary Mattis has made no decisions on a troop increase for Afghanistan," said chief Pentagon spokesperson Dana White.

"As he said throughout the week in testimony, the revised Afghanistan strategy will be presented to the president for his approval in the coming weeks."

Pentagon sources said Mattis has been considering sending 3,000 to 5,000 troops to buttress the NATO training mission, known as Resolute Support.

The U.S. has about 8,400 troops in Afghanistan as part of the NATO mission of roughly 11,000 troops.

"Any decisions about troop numbers will be made only after consultation with the interagency, the Afghan government, NATO allies and coalition partners," White said.

Mattis is expected to attend a NATO defense ministers meeting in Brussels at the end of the month, and told Congress this week he would be delivering his revised strategy to President Trump by mid-July.

"The president has delegated force management authority for Afghanistan to the secretary," White said. "The secretary will continue to follow the president's guidance on our overall strategy."