He began his managerial career with Colo-Colo. He won two national championships (1986 & 1989), finished runner-up twice (1987 & 1988), and won the Copa Chile three times with Colo-Colo. After that impressive run with Colo-Colo, Salah took charge of the Chilean national team from 1990 to 1993. In 1991 he led "La Roja" to a third place in the Copa America. He stayed in charged of "La Roja" for 30 games, of which he won 12, tied 7, and lost 11.
After that he was hired as the coach of Universidad de Chile. His first stint with the team lasted one year before he moved to coach Mexican team Monterrey.
In 2001, Salah was hired as National Director of Chiledeportes, turning back to coaching in 2003. In Huachipato Salah raised the team's level of play and reached the 2006 Copa Sudamerica, being eliminated by Colo-Colo. He stayed with the team until 2007 when he was hired by Universidad de Chile.
In his career he has coached 421 games, won 209, tied 124, and lost 88.