Sehwag missed India's final group match, an 80-run win over the West Indies in Chennai last week after suffering an allergic reaction to a painkilling injection in his right knee.
India captain Mahendra Singh Dhoni said on Wednesday the dynamic run-scorer's fitness was still an issue.
"We are taking a call on Viru in the evening or maybe tomorrow morning before the start of the game," Dhoni said. "Apart from that, all the others are fit."
Sehwag has scored 7,707 runs including 14 hundreds in 233 one-day internationals at an average of 35.35.
But a strike rate of over 104 is arguably the most telling statistic, as it is evidence of his consistent ability to get the innings off to a blistering start that leaves the opposition on the defensive.
"It's really good to have Sehwag opening the innings, because if the deliveries are short and to the body or somewhere else, he's the kind of batsman who can make the most of that kind of bowling," Dhoni explained.
Dhoni, himself a hard-hitting middle-order batsman, added: "He can play an aggressive game, change the course of a match in the first five overs and give your team the kind of momentum that is needed."
However, Sehwag has never made an ODI hundred in 27 matches against Australia and he averages a modest 22.65 against the world champions.
If Sehwag is ruled out, India are set to retain Suresh Raina, brought in against the West Indies, and keep Test opener Gautam Gambhir at the top of the order to partner Sachin Tendulkar.
India sweat on Sehwag fitness
Advertisement