Haddin's return meant there was no place available for Tasmanian wicketkeeper Tim Paine, who played in the Test and one-day series in India this month.
"It’s exciting to see the return of Peter Siddle and Brad Haddin into international cricket," chairman of selectors Andrew Hilditch said.
"Peter is a key bowler in all forms of the game and has made a return from injury and is now ready to take his place in the Australia Twenty20 squad.
"It is unfortunate for Tim Paine, having played so well for Australia recently, to miss out on this squad but Brad has made a very good recovery from his elbow injury and is an established member of our side in all forms of the game."
Hilditch said the squad assembles some of Australia's best young talent as they broaden their international experience.
"Players like Steve Smith, Ste