Mitchell Marsh has been called up as cover for injured Marcus Stoinis following a side strain that ruled him out of the clash against Pakistan in Taunton.
Stoinis suffered from a side strain in Australia’s encounter with India at The Oval.
However, Australia haven’t decided to rope in Marsh as a permanent replacement as it requires an approval from World Cup’s event technical committee.
The ICC regulations allow injured players to be replaced during the tournament but then they cannot rejoin the squad even if they regain full fitness.
"Stoinis has a bit of a side strain," Finch told reporters in Taunton.
"He won't be available for tomorrow. So we're going to have to juggle around especially that all-rounder spot and have got Mitch Marsh flying over just as a bit of a precaution.
"(We're) not exactly sure on how many games he'll miss. It's still being assessed. Over the next couple of days we'll have a clearer picture on what that looks like.”
Marsh was initially not in the 15-man squad but is a part of the Australia A squad which will play practice matches in England ahead of the Ashes series.