Sagbo has been charged by the FA with improper conduct after he praised Nicolas Anelka on Twitter.
In the hours after Anelka's 'quenelle' gesture in December, Sagbo posted a picture of the France striker and the word 'legend'. Sagbo has since deleted the message.
Bruce said: "It's difficult with Yannick, we need to use an interpreter. He doesn't speak a lot of English. It's broken.
"He doesn't understand why he's been charged. He thinks 'what have I done wrong?'.
"He tweeted that Nicolas Anelka's a legend. In some people's eyes, he is. That's nothing to do with his gesture. He's been a great player.
"But we've now got into the realms of what offends people and what doesn't.
"If we have offended anyone, on behalf of the club, I can only apologise."
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