According to Spanish outlet Diario Gol, Morata told Real chief Florentino Perez that Zidane would be a problem when he left for Chelsea.
And he brought that warning back up on Saturday in a WhatsApp conversation with his old Real team-mates.
Morata's compatriots Nacho, Dani Ceballos, Isco, Marco Asensio, Dani Carvajal and Sergio Ramos are said to be in the group chat in question.
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Alvaro Morata thinks Zinedine Zidane will cause problems at Real Madrid
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And they are believed to be receptive to his message that Zidane is a danger.
Diario Gol's report suggests the impact of Morata's absence was noted after the defeat to Barcelona.
And Perez is apparently unwilling to forgive Zidane for selling the Spaniard to keep Karim Benzema.