KABUL: Kabul on Friday endorsed US general John Nicholson's call for thousands of additional troops in Afghanistan to stave off a resurgent Taliban, ahead of what is expected to be another intense fighting season.

Afghan forces, beset by record casualties, desertions and "ghost soldiers" who do not exist on the pay rolls, have been struggling to rein in the Taliban since US-led NATO troops ended their combat mission in December 2014.

Thousands of extra coalition troops were needed to break the war out of a stalemate, Nicholson, the top US commander in Afghanistan, told the US Congress on Thursday, in what could be President Donald Trump's first major test of military strategy.

"We welcome the proposal of deploying thousands of additional troops to Afghanistan to effectively train and advise Afghan forces," Dawlat Waziri, the defence ministry spokesman in Kabul, told AFP.

"The war in Afghanistan is a war against terrorism and we want this war to reach a successful end. In that regard we think this is a positive step."

There are currently more than 13,000 NATO troops -- including 8,400 US forces -- deployed to Afghanistan for training and counter-terrorism purposes, down from a peak of about 140,000 in 2011.

Trump would seek the advice of Defense Secretary James Mattis before deciding on Nicholson's request for reinforcements, White House press secretary Sean Spicer told reporters.

Trump had suggested in a recent call to Afghanistan's President Ashraf Ghani that he would consider sending more soldiers, according to media reports.

The White House said the pair spoke again on Thursday to "discuss opportunities to strengthen the bilateral relationship in areas such as security, counterterrorism cooperation".