All-rounder Marcus Stoinis has been cleared of his hamstring scare and will play against the Afghans.
Australia sit in third spot in their group behind leaders New Zealand and England – all three nations have five points.
The Kiwis play Ireland in Adelaide on Friday afternoon before Australia’s game, while England meet Sri Lanka in the last game of the group on Saturday.
Should the three favoured nations win, net run-rate will decide the two countries progressing to the semis but Finch was wary of overly focusing on the maths equations.
“You still have to earn the right to be able to push for a net run rate,” he said.
“The the last thing that you want to happen is you push too hard, you compromise the two points (for winning) and then potentially if something happened in the Sri Lankan-England game, you leave yourself vulnerable.
“There’s obviously some scenarios there that we need to keep an eye on throughout the game so, if we get in a good position, that we can maximise it.”