Born in Santiago, as a child Páez was with Juventud Universitaria and next he moved to Universidad Católica.
[3][4][5] Lota Schwager, with Páez in the squad, got the best season in its history after reached the sixth place in the 1977 Primera División.
[7] He played for Cobreloa in 1980 and 1981, making 47 appearances and scoring 8 goals and winning the league title in 1980.
[13] Abroad, Páez had a stint with the Indonesian club Persib Bandung (2003–04), saving it from the relegation to the lower division.
In the club, he coached his compatriots Alejandro Tobar, Claudio Lizama, Julio Lopez and Angelo Espinosa.