(Photo by Doug Pensinger/Getty Images)
Sources also confirmed that the Nats sent left-handed reliever Joe Beimel to the Colorado Rockies
for two minor league players, as yet undisclosed.
Johnson, a free agent after this season, hit .294/.408/402 with six home runs and 63 RBIs this season for the Nats, in his sixth season with the organization.
He was the last player to wear the tri-colors of the Montreal Expos in the organization.
According to one scouting service, Thompson has a 87-90 MPH fastball and plus slider to go along with pinpoint command.
Beimel spends less than one season with the Nats. He was 1-5 with a 3.40 ERA and one save in 45 appearances.