The Huddersfield midfielder, who has 64,500 followers, had his Instagram biography replaced with the words, “HACKED BY TURKISH HACKERS”.
Mooy’s profile picture has also been replaced by a Turkish flag, with all 491 of his previous posts being deleted.
It appears a Instagram user named mafyapenguenx is the culprit, posting a ’trophy’ picture of Mooy’s compromised account.
The 27-year-old played in the Terriers’ 1-1 draw with Brighton overnight (AEST) - lasting the full 90 minutes.
He is yet to comment on the Instagram attack via his Twitter or Facebook accounts.