Finch, who injured his right calf muscle while playing for Surrey last month, has not played a single game on this tour of India.
In his absence, 25-year-old Hilton Cartright made his debut as an opener but cut a sorry figure in the first two ODIs. In Chennai, he was bowled by Jasprit Bumrah for one and in Kolkata he was cleaned up by Bhuvneshwar Kumar for an identical score.
To Australia's relief, Finch hit the nets today and also looked smooth while running during the morning practice session.
"I think you know what he will bring. He is a very good player and he has played a lot of cricket for us in the past couple of years," Warner told reporters.
More From This Section
"He brings a lot of aggression at the top of the batting order. It was good to see him practising hard and hopefully he will be fit for the game tomorrow."
Warner also came out in defence of young Cartright.
"It is challenging for a young guy to take the bull by the horns. It is very difficult when you play on the world stage against the best ODI teams, it can get overwhelming," Warner said.
"He brings a lot of energy. He is a workaholic and brings in a lot of knowledge to the game," he signed off.