Williams has not played since losing to Ajla Tomljanovic in the third round of the US Open in 2022
Serena Williams has filed the necessary paperwork for a return to tennis - but then said she is "not coming back" to the sport.
The American great, who won 23 Grand Slam singles titles, retired after the 2022 US Open.
The International Tennis Integrity Agency has confirmed to BBC Sport that Williams, 44, is back on the list of players registered for the drug testing pool.
Her name also appears on the most recent document published by the organisation on 6 October.
