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Rivers hinted during a conference call on Wednesday that his words might have raised the league's antenna.
"I didn't think I said much and that could be a problem," Rivers said. "Because all I basically said was, Kevin getting into foul trouble had a huge impact on the game. That's not criticizing officials. So I've just got to make sure I focus on our stuff."
Rivers signed a five-year, $35 million contract extension with Boston after the 2010-11 season. Garnett was fined $25,000 earlier this season for his role in a dust-up with the Brooklyn Nets, while Chris Wilcox earned a $25,000 for an obscene gesture on the JumboTron during a game in Philadelphia.