Cavani has been suspended, fined and ordered to take a "education programme" after a social media post made to a close friend.
The forward deleted the post soon after and issued an apology, but he was charged with using insulting and/or improper words, and pleaded guilty to the FA charge.
After Cavani posted a response to his ban, former United midfielder Herrera jumped to the support of his ex-PSG teammate.
Herrera said: "If they ban you for that. The world is going to s***. Big hugs and stay strong Edi."
Meanwhile, current United defender Marcos Rojo said to Cavani: “Those who know you know the kind of person you are!!!"
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