Real Madrid defeated Getafe 2-0 in the La Liga fixture at Santiago Bernabeu on Saturday night.
David Alaba started the counter-attacking move and blasted a left-footed shot past Barcelona goalkeeper Marc-Ander Ter Stegen.
Real Madrid winger Lucas Vazquez has been ruled out for the rest of the season with a knee injury, his club have confirmed.
Zidane said his team has hit the physical limit after the 2-1 victory against Barcelona on saturday at the Estadio De Stefano.