The Brewers traded Lara and KJ Harrison to the Nationals on Friday in exchange for Gio Gonzalez, Bob Nightengale of USA Today reports.
Lara suffered a fractured right fibula and dislocated right ankle while playing for Helena in the rookie Pioneer League, Todd Rosiak of the Milwaukee Journal Sentinel reports.
Lara, 18, is slashing .209/.279/.273 with one home run, two steals and a 30:9 K:BB in 110 at-bats in the Pioneer League.
Lara will kick off his 2016 campaign at extended spring training, Tom Haudricourt of the Milwaukee Journal Sentinel reports.