Isco has bemoaned a lack of opportunities to start at Real Madrid, with the Spain international remaining on the fringes of the Los Blancos squad this season.
The midfielder responded to former Real player Ruben de la Red on Twitter, who said Isco was "not performing to the required level" to be selected.
According to Joe Krishnan of the Evening Standard, Isco replied:
"Totally in agreement with De La Red, but when you don't enjoy the same opportunities as your team-mates, things change. Even so, I keep working and fighting hard as I wait for them!