Bairstow averaged just 23.77 against Australia after managing one fifty in 10 innings, while he averages 24.23 in Tests since the start of the 2018 summer having notched one century in 17 games.
England, then captained by Sir Alastair Cook, won 2-1 in South Africa in 2016, while they beat the Proteas 3-1 in England in 2017 in current skipper Joe Root's first series as captain. The latter half of the PSL, which will be played between 20 February to 22 March will be coinciding with England's two Test tour to Sri Lanka, and given how effective Ali was on Sri Lankan pitches the last time England toured the country with 18 wickets, he will be considered for selection once again around that time. Mark Wood also makes his way back into the longer format, who has been out since the World Cup final in July because of knee injury.
He has played no competitive cricket since, but has been part of an advance England group already training in Cape Town and is expected to be available for selection at Centurion.
Jonny Bairstow, who was dropped from the team that played against New Zealand is also included for the squad.
Jonny Bairstow, James Anderson and Mark Wood have been recalled to England's Test squad for the four-match series in South Africa which begins on Boxing Day.
Anderson and Wood's returns means Lancashire paceman Saqib Mahmood - an unused member of the Test squad in New Zealand - drops out.
"There is no exact date given for his return, but the medical team is working towards him becoming fully available for selection during the tour", Smith added. "With that in mind, and given the extended period that James and Mark have had on the sidelines due to injury, it was sensible to have a 17-man squad". He will be given further opportunities to prove he is the long-term opening partner for Rory Burns while Kent's Zak Crawley, who made his debut in the second Test in Hamilton, also keeps his place in the squad as one of two extra batsmen alongside Bairstow.
Cape Town - The confirmed return on Saturday of veteran James Anderson, highest pace-bowling wicket-taker of all time in Tests, to the mix is the most salient feature of England's 17-strong party for the looming four-Test series in South Africa. England are considering an all-out seam attack for some of the Tests in South Africa and there is no guarantee that Leach would have been usurped by Moeen in the pecking order anyway. He has been picked as a proper backup for Jos Buttler in the Test series starting on Boxing Day.