It comes as in-form Steve Smith urges selectors to keep the faith in Labuschagne, saying it was not long ago he was in a similar predicament to the faltering No.3.
Labuschagne's lukewarm form continued in Australia's 2-0 series defeat of Sri Lanka, with the Queenslander making scores of 20 and 4 in his first two knocks.
The 30-year-old looked to be finding his feet as he made an unbeaten 26 in a 37-run stand with Usman Khawaja that sealed victory in the second Test in Galle on Sunday.
But despite that effort and handy half-centuries in Melbourne during the recent India series, Labuschagne has only made one century in his past 51 Test knocks.
Since the beginning of 2023, Labuschagne has averaged 31.5, well down on the 62.3 he managed across the four calendar years before then.
The timing looks unfortunate with a glut of batting options available for the WTC Final against South Africa at Lord's in June.
Cameron Green is set to return to the selection frame as a middle-order option following back surgery, while Josh Inglis impressed with a century on debut in Sri Lanka.
Sam Konstas is pushing for a recall after being ousted from the top to facilitate Travis Head's shift from No.5 and Nathan McSweeney is vying for a first Test in his preferred middle-order spot.
"It's clear that we've got some players that have put their hand up, so there is a squeeze," said coach Andrew McDonald.
"Whoever misses out will be very unlucky."
Australia could change their XI around between the WTC Final and the three-match West Indies series that begins later in June.
McDonald said it was "highly likely" the squads would be different for the two, but Australia will defer selection calls, including on Labuschagne, until closer to June.
"England creates a different challenge and then off to West Indies, which can spin, it can also swing and seam," McDonald said.
"The beauty of it is we've got some time before we have to make some decisions.
"It's great to have options. Will they all be fit at that time? Who fits what conditions and when? I think that's going to be the art of what transpires across the journey."
Smith remains confident Labuschagne is approaching a big score, sceptical about claims his close mate is even out of form.
The stand-in captain went as far as to say he had recently been in a similar situation to Labuschagne, feeling at his best despite scores of 0, 17 and 2 to begin the home summer.
Smith has since scored centuries in four of five Test matches since those lean figures against India and was player of the series against Sri Lanka.
"Marn's similar to me, in a way," Smith said.
"I've said this a lot of times about myself, there's a difference between being out of form and out of runs.
"I don't think he's out of form, personally. I've watched him train, I've watched him play and a lot of the things that he's done so well are there.
"He knows he'd love to score more runs, we'd love him to score more runs, but in my opinion, it's just around the corner."
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