Australia skipper Steve Steve said that they will not name the playing XI for the third Ashes Test against England until the toss on Thursday morning.
However, he did indicate that the hosts might go with an extra seamer in the form of all-rounder Mitchell Marsh.
The hosts, 2-0 up in the five-match series, could reclaim the coveted urn in Perth and Smith said Marsh would be included, probably for Peter Handscomb, if the WACA track was not quick enough.
"We're going to have another look at the wicket in the morning and decide if we need that extra bowling option," Smith told a news conference.
"The stats suggest over the last couple of years the bowlers have had a pretty heavy workload on this wicket, so we're probably leaning that way at the moment.
"It's probably not as hard as I'd have liked it to be a day out but 24 hours can change a lot and in the morning hopefully it's a bit harder and faster."
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