Warner was in doubt for the blockbuster day-night showdown at Adelaide Oval, starting Thursday, after the opener did not bat or field in the second innings of Australia's nine-wicket rout of England in Brisbane last week.
But Warner – who scored 94 runs in the opening innings of the first Test – has been declared fit to play after Australia captain Pat Cummins confirmed his XI on Wednesday.
"He'll be right," Cummins told reporters. "He had a bat yesterday, batted with a bit of discomfort but knowing Davey, he's not going to miss this one. Once adrenaline and everything kicks in, [he'll be] a little bit sore but he'll be fine.
"It's one thing batting in the nets but another thing when you walk out and it's a packed crowd. I don't think he had any kind of painkillers or anything yesterday.
"He's played close to 90 Tests, I'm sure a lot of them have been played in discomfort or with [niggles] going into the game. He'll be fine tomorrow."
Meanwhile, Jhye Richardson will make his international return for Australia after replacing injured paceman Josh Hazlewood (side strain) – the only change to the starting XI.
Richardson got the nod ahead of Michael Neser for the pink-ball Test, having not featured for Australia in cricket's longest format since his debut in 2019.
The Australia attack will be licking their lips at the prospect of doing more damage with the pink ball, where they will be hunting what would be a sixth win in seven matches in the longest format in Adelaide.
No side has a better record than Australia's eight out of eight in day-night Tests, while England have lost three day-nighters out of four and their only victory was against West Indies in 2017.
Australia XI: Marcus Harris, David Warner, Marnus Labuschagne, Steve Smith, Travis Head, Cameron Green, Alex Carey, Pat Cummins (c), Jhye Richardson, Mitchell Starc, Nathan Lyon.
India collapsed from 134-1 to 255 all out in Mumbai on Tuesday after Shikhar Dhawan (74) and KL Rahul (47) put on 121 for the second wicket.
Mitchell Starc took 3-56, while there were two wickets apiece for Pat Cummins (2-44) and Kane Richardson (2-43) in a superb performance in the field for the tourists.
The magnificent Finch (110 not out from 114 balls) and Warner (128no off 112) reached the victory target with 12.2 overs to spare, staging the highest opening stand in an ODI against India, as Marnus Labuschagne was not required to bat on debut.
Warner become the fourth fastest to 5,000 ODI runs – and the quickest Australian – in the process and has four centuries in his last eight international knocks in the 50-over format.
India, beaten by Australia in a series on home soil last year, also lost Rishabh Pant to concussion when he was struck on the helmet, Rahul taking the gloves in his absence in the first of three ODIs
Dhawan got his timing going after a slow start, reaching his 50 in the 20th over with Rahul in good touch at the other end after Rohit Sharma was removed by Starc.
Spinners Adam Zampa and Ashton Agar did a good job of keeping the run-rate down in the middle overs, though, and the left-arm tweaker drew a false shot from Rahul for a much-needed breakthrough.
Cummins came back into the attack to strike a big blow by ending Dhawan's innings in the next over and Virat Kohli (16) was caught and bowled by Zampa immediately after hitting him for six.
Shreyas Iyer also failed to hang around before Ravindra Jadeja (25) was caught behind attempting to cut Richardson, and Pant (28) departed in painful fashion, an attempted pull off Cummins hitting his helmet and resulting in a catch for Ashton Turner.
India added only 42 runs for the last five wickets and play was stopped due to a kite flying into the stadium before Warner and Finch blew Kohli's side away.
Warner successfully reviewed when he was given out caught behind hooking in the sixth over and needed only 40 balls for a half-century, with Finch raising his bat soon after.
Both openers smashed Kuldeep Yadav over the rope and continued to pierce the field with exquisite strokes on both sides of the wicket, Warner also overturning an lbw decision when he was struck on the pad by Jadeja.
Warner leapt in the air with his trademark celebration after majestically cutting Jasprit Bumrah for four off his 88th ball before Finch swept Jadeja to the boundary for a 15th ODI before stunned India were put out of their misery.
