Felix left Chelsea for Ronaldo's Al-Nassr at the age of 25 and with his best career years still ahead of him.
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And the move has been questioned by podcast Chuveirinho, which caught the attention of Ronaldo.
Taking to social media, the Portugal captain called out the podcast's hosts for their opinion.
"Idiots don't understand anything about football, yet they still give their opinions," Ronaldo wrote, alongside three crying emojis.