Steyn has not played for the Proteas since last March, but the paceman is set to return against Eoin Morgan’s side.
De Kock was named as permanent ODI skipper ahead of the ongoing series with England and will also lead his country in the shortest format, as Faf du Plessis has been granted an extended period of rest.
Kagiso Rabada has also been given extra time off after being rested for the ODI series, which South Africa lead 1-0 with one match to play at the Wanderers on Sunday.
Uncapped batsman Pite van Biljon and seamer Sisanda Magala were included in the squad for a T20 series that gets under way with a day-night contest at Buffalo Park, East London next Wednesday.
Magala’s participation is dependent on him passing a fitness test.
Cricket South Africa acting director of cricket Graeme Smith said: “We are pleased with the group that we have selected for this upcoming T20 series against England.
“We have once again taken the opportunity to reward some of the hard workers of our domestic franchise system while some of our key senior players continue with their much-needed rest period and we have again, put our faith in Quinton to lead this group of exciting cricketers, picking up where he left off in India where he showed exemplary leadership.”
He added: “With a T20 World Cup not too far away, we have begun the process of identifying several players whom we will be looking at over a period of time and hope that by the time September comes along, we will have the best possible squad of 15 representing South Africa.”
South Africa squad:
Quinton de Kock (captain), Reeza Hendricks, Temba Bavuma, Rassie van der Dussen, David Miller, Pite van Biljon, Dwaine Pretorius, Andile Phehlukwayo, JJ Smuts, Beuran Hendricks, Tabraiz Shamsi, Lungi Ngidi, Sisanda Magala, Bjorn Fortuin, Dale Steyn, Heinrich Klaasen.
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