Originally Australia had intimated that Starc’s replacement would be a fast bowler but given the expected nature of the wickets in Bangladesh they have added to their spinning stocks.
National Selector Trevor Hohns said: “We are comfortable with the fast-bowling stocks we have in the squad so have opted to add an additional spinner given the conditions we are likely to face in Bangladesh.
“Mitchell is a very exciting young leg-spinner who we think will benefit immensely from further experience in the sub-continent.”
This brings the total number of spinners in the squad to three with Nathan Lyon and Ashton Agar already named in the group.
Swepson was part of the squad that toured India but neither he nor Ashton Agar played any Tests with Steve O’Keefe earning the second spinner spot behind Nathan Lyon.
The 23-year-old leggie has played 14 first class matches taking 41 wickets at an average of 32.82.
Australia will play two Tests in Bangladesh with the first getting underway on August 27.