Ekaterina Alexandrova has been called up to replace Keys after Andreeva, currently ranked as world No 9, chose not to sign in because of not being fit to compete in today's matches, according to the Women's Tennis Association.
Recent reports have emphasized issues about how players are facing challenges by the tournament organizers.
Greetings to another day at the WTA Finals. While both matches offer thrilling action, the main event showcases Iga Swiatek competing against Anisimova.
Their previous encounter at the Wimbledon Championships four months ago was remarkably one-sided, with the Polish star achieving a decisive double bagel win. However, the American player made an impressive comeback shortly after, overcoming her opponent in straight sets during the US Open quarter-finals.
Today's match marks the third chapter of their competitive rivalry, with the victorious player advancing to the next round in the Saudi Arabian capital.
Before that contest, Rybakina will compete against Alexandrova instead of the originally scheduled opponent. Keys withdrew due to illness in what constitutes a meaningless match, paving the way for the world No 10 to participate. The Kazakh star aims to maintain her unbeaten record, having previously defeated both Swiatek and the American contender to claim her semi-final spot.
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