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Nato's Resolute Support mission would not immediately release any details about the soldiers, but said they had been killed when an improvised explosive device (IED) detonated near Ghazni city in central Afghanistan.
An American contractor was also wounded in the attack in Ghazni. Attack helicopters flew in to support the evacuation of the wounded.
The deaths are the latest in a growing toll on USA forces in Afghanistan following the death of an army Ranger following an operation against al Qaeda militants in Nimruz province on Saturday.
The deaths came just days after Sgt. Leandro Jasso, a member of the elite 75th Ranger Regiment, was killed battling al-Qaida fighters during a raid in southwestern Nimruz province.
In June of 2017, the Taliban claimed an attack where an Afghan soldier shot and killed three US soldiers in the Achin district of the eastern Nangarhar province.
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An initial review showed the soldier was "likely accidentally shot by our Afghan partner force", a North Atlantic Treaty Organisation statement said on Tuesday, adding that the "tragic" incident occurred as they engaged in a battle with Al Qaeda militants. The two districts, which are predominantly comprised of Hazara populations, were considered to be the most secure rural districts in all of the country.
Senior U.S. military officials have sought to reassure Afghan forces. More typically, a general carries a pistol.
Resolute Support believes the soldiers was accidentally killed by an Afghan soldier in close quarters combat "during an assault on one of multiple barricaded al Qaeda shooters".
The US, alongside with North Atlantic Treaty Organisation has been present in Afghanistan in the form of the Resolute Support Mission.
The soldier's death follows a spate of so-called "insider attacks" that have rattled foreign troops tasked with training and assisting Afghan security forces.
During that same period, 58 USA troops were killed, he said.
The number of American casualties has fallen dramatically since the end of 2014 when Afghan forces took over from US-led North Atlantic Treaty Organisation combat troops to secure the country.