Agar is the 2020 Bradman Young Cricketer of the Year, an award also etched with the names Brett Lee, Shane Watson and David Warner. Agar was also named the Neil Dansie Medal winner as the most outstanding South Australian male cricketer.
Banton and his Somerset teammate, allrounder Lewis Gregory, will both be involved with England's upcoming tour of South Africa which will see them miss the start of the BBL next month.
Having made his debut last year, the right-handed batsman scored 361 runs at a strike-rate of 164, smashing 45 boundaries and 12 sixes and registering four half-centuries during the campaign.
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.
