Liverpool academy director Frank McParland confirmed that Pelosi, 17, will head to Merseyside after leaving California side De Anza Force.
Pelosi has made 28 appearances for the United States Under-17s and captained the side during the junior World Cup in Mexico.
"We're determined to identify the best possible talent globally and I'm delighted we've been able to bring Marc in to the club," academy director Frank McParland told the official site.
Source: AFP