The controversial ex-Sky Sports man, 61, made the X-rated comment during a broadcast of Manchester City's win over Bournemouth.
Keys appeared to think his mic was off when he was heard angrily swearing at an unknown player over the commentary.
He appeared to angrily mutter the phrase "bag of s***" as Riyad Mahrez passed the ball out wide to Oleksandr Zinchenko.
However, it is unclear who Keys was referring to or indeed if it was even the City-Bournemouth game – with it being likely he was watching all 3pm games from the studio.
Either way, fans cottoned on to the incredible rant, with many taking to social media in an attempt to confirm their suspicions.
One wrote: "Anyone else pick up Richard Keys there on BeIN ????"
Another said: "Brilliant, @beINSPORTS just left the mic on catching Richard Keys saying 'bag of s***' on live television."
A third added: "Don't know if anyone heard on Bein Sports but #RichardKeys straight up called someone or one of the teams, 'a sack of s***' not realising his Mic was switched on…
"Didn't Sky can him for something similar?"
Keys certainly has been in trouble for these sort of comments – and was sacked alongside Andy Gray amidst a sexism row regarding comments made at Sian Massey.
The pair described the Premier League’s first female assistant referee as “a bit of a looker", adding, "What do women know about the offside rule?".
Before that, Keys blurted out, "Daft little ground, silly game, f*** off!", in regards to a game between the Faroe Islands and Scotland.
Keys' 34-year marriage also ended last year after he had an affair with his daughter's friend, Lucie Rose.
Meanwhile, his disgraced fellow pundit Gray has been dumped by his wife after she found sexy texts to two other women on his phone.
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