Cavani, 33, found himself in hot water with the FA in November after he made a controversial Instagram post following his winner against Southampton at St Mary's.
The Manchester United striker, who arrived at Old Trafford as a free agent on deadline day, would later delete the post and issue an apology.
However, the FA charged Cavani for using insulting and/or improper words in the social media post.
The Uruguayan star will now serve a three-match ban and has been hit with a £100,000 fine, as well as being required to complete a "face-to-face" education programme.
Herrera, who left United in 2019 for a free transfer to PSG, took to Instagram to defend Cavani by saying the "world is going to s**t."
The 31-year-old former United midfielder wrote: "If they ban you for that. The world is going to s**t. Big hugs and stay strong Edi."
Cavani has since broken his silence and apologised for the message, saying it was always intended to be "an expression of affection towards a friend."
The United star wrote: "Hello everyone, I do not want to extend much in this uncomfortable moment for me.
"I want to share with you that I accept the disciplinary sanction knowing that I am foreign to English language customs, but I do not share the point of view.
"I apologise if I offended someone with an expression of affection towards a friend, nothing further was my intention.
"Those who know me know that my effort is to always seek the simplest joy and friendship!
"I appreciate the countless expressions of support and affection.
"My heart is at peace because I know that I always expressed myself with affection according to my culture and way of life. I send you a sincere hug."
Cavani will be ruled out of United's Premier League clash against Aston Villa, League Cup semi-final match against Manchester City and FA Cup tie against Watford.
Featured Image Credit: PA
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