The West Indies produced another dominant day with the ball against Australia and then survived a tense final hour Saturday to take the honours after the first day of the day-night third Test.
Khawaja said he was still good with bat in his hand and that "age is just a number".
Uncapped New South Wales batsman Usman Khawaja was named on Tuesday in Australia's 14-man squad on Tuesday for next month's two-Testseries against Pakistan in Britain.
Gillespie said that he feels that either one of Labuschagne or Usman Khawaja, the 38-year-old who failed to touch double-digits in both WTC final innings, will miss out on West Indies tour, which comprises three Tests, starting June 25.
Uncapped McSweeney to open with Khawaja in India series
Images from Day 1 of the third Test between Australia and India in Brisbane on Saturday.
Mahmood has played two Tests, 9 ODIs and 18 T20s for England.
The entire Australian top-order that is feeling the "pressure" despite the series-levelling win in Adelaide
A heated exchanged between India captain Jasprit Bumrah and Australia opener Sam Konstas lit up an eventful Day 1 of the fifth and final Test.
South Africa's dream start to the World Test Championship final quickly turned into a nightmare at Lord's, as their batters failed to back up Kagiso Rabada's five-wicket masterclass.
Australia's two-time World Cup winning captain Ricky Ponting says senior batsman Usman Khawaja was axed from the national team due to his inconsistency but he is not willing to write him off yet. The 33-year-old Khawaja was recently left out of the Australia's annual list of contracted players after he was dropped midway through last year's Ashes.
Change will be a key theme for both the West Indies and Australia in their upcoming three-Test series in the Caribbean with the visitors set to field a remodelled batting line-up and the hosts being led out for the first time by Roston Chase.
Virat Kohli's conduct came under the microscope in the Boxing Day Test in Melbourne on Thursday after a clash of shoulders with teen debutant Sam Konstas, but the incident did little to knock the Australian wonder boy off his stride.
On Day 5 of the 3rd Test at the Gabba in Brisbane, Bumrah shook up Australia's top order early after lunch to carve his name in the annals of Indian cricket history.
The 31-year-old was out of action since undergoing a surgery on a torn meniscus which he had sustained during their Test series against Pakistan in October in the UAE.
Usman Khawaja's marathon 160 and Alex Carey's career-best 93 helped Australia rack up 505 for eight against Pakistan on Day 2 of the second Test in Karachi on Sunday.
Usman Khawaja scored his second century of the match to help Australia to 265 for six declared on the fourth day of the fourth Ashes Test on Saturday, handing England an unlikely victory target of 388.
Bumrah, who claimed an eight-wicket match haul in India's 295-run win in the series opener, showed signs of discomfort while bowling the 81st over of Australia's innings.
'I think it have seen the side-ons (bowlers) but he delivers the ball from about a foot or even a bit more closer to the batsman than the average bowler so the ball feels quicker even than the pace he is actually bowling at.'
'Have a look where Virat walks. Virat's walked one whole pitch over to his right and instigated that confrontation. No doubt in my mind whatsoever.'
Taking aim at senior players like Mitchell Starc, Josh Hazlewood, captain Pat Cummins and Nathan Lyon, among others, he said that if their aim was to prolong their send-offs till after the Ashes, it was a wrong mindset.
With Green out with injury, Bancroft's chances have brightened.
A century stand from Steve Smith and Usman Khawaja propelled Australia to a nine-wicket victory over Ireland in their one-off One-Day International played at Willowmoore Park on Tuesday. Ireland won the toss and elected to bat but were bowled out for 198, a target that never looked enough against the Australians, who posted 199 for one for the loss of opener David Warner (48), with almost 20 overs to spare.
Former No. 1-ranked Test batter Marnus Labuschagne and Usman Khawaja would open the innings for Australia in the WTC final against South Africa while the fit-again Cameron Green would bat at the No. 3 position.
Australia, who have already secured their place in the final of the World Test Championship against South Africa, won the opening Test, also in Galle, by an innings and 242 runs.
Australia carved out an 82-run lead over West Indies on day two of the first Test in Barbados on Thursday, with the hosts frustrated by several close umpiring calls that went against them.
Australia, on their first tour of Pakistan in 24 years, finished day three 205 behind but scored freely after resuming on five for no loss.
Images from Day 3 of the fifth Test between Australia and India at the Sydney Cricket Ground on Sunday.
Khawaja and Smith steadied the ship batting through the second session.
Beau Webster believes playing against India pacer Jasprit Bumrah will be an enormous challenge for the Australian pacers on the seamer-friendly SCG pitch.
Following the retirements of Chris Rogers, captain Michael Clarke and all-rounder Shane Watson, Smith will lead a team in transition into the three-match series which wraps up with cricket's first day-night Test at the Adelaide Oval.
The debate over the vacant slot at the top of the Australia batting order continues to captivate the nation's sports media a month before the opening clash in a blockbuster five-Test series against India.
Usman Khawaja along with three others was suspended for one Test during Australia's tour of India in 2013 for not submitting a 'homework' assigned by the coach.
'King Bumrah has taken the mantle now. Kohli looks dejected, and this was a crucial knock for him. He has come up short yet again.'
Virat Kohli fined 20 per cent match fees, one demerit point for his altercation with Sam Konstas
'I like to think we're starting to move on from that, but there's definitely still that undertone ...'
Out-of-favour opener Usman Khawaja, who clashed with Justin Langer during Australia's tour of UAE in 2018, has backed the embattled coach to continue in the position through the Ashes and urged the payers to stop undermining him.
Australia's stand-in captain Steve Smith hailed his side's resounding innings and 242-run victory over Sri Lanka in Galle on Saturday as "near flawless" after the visitors retained the Warne-Muralitharan Trophy.
The third Test between Australia and India in Brisbane faces a grim weather forecast, with rain predicted to impact the remaining four days.
Images from Day 4 of the fourth Test between Australia and India at the MCG on Sunday.