 He officiated in numerous international competitions, including the 1999 FIFA Confederations Cup, 1997 FIFA World Youth Championship, and qualifying matches for the 1998, 2002, and 2006 World Cups.Aquino also served as a referee in the 1999 and 2001 Copa América competitions, officiating the final in 2001.After retiring from his career as a match official, Aquino has worked as referee coordinator for the Asociación Paraguaya de Fútbol.