Galca took over from Sergio Gonzalez last December with the club mired in a relegation struggle, and eventually lifted them to a 13th place finish, five points above relegation.
The former Espanyol midfielder's contract runs through until June 30 but the club said on Friday they would not prolong his stay.Â
Outgoing coach at relegated Rayo Vallecano Paco Jemez, recently sacked Watford coach Quique Sanchez Flores and former Marseille handler Michel are all thought to be potential replacements.