The 31-year-old has represented England in every format of the game having made his Test debut in 2012. Bairstow was representing SunRisers Hyderabad in the Indian Premier League
His availability will be determined on Australian selection in the Test squad for the series against India, with those Sixers players selected for the entire series likely to be available for the last three games of the regular season
"I'd like to thank my family, my parents Pauline and Jim, and my wife Rhiannon who have supported me through the journey," Ferguson said in a statement.