India sorely missed the attacking intent of Sehwag at the top of their innings in the ignominious 337-run loss to Ricky Ponting's team in the opening Melbourne Test.
The shot-making right-hander averages 49.46 in 52 Tests but has been left out of the Indian team for a year after a lacklustre series in South Africa, where he averaged just 14.83 in six innings.
Sehwag was one of the standouts on India's last tour to Australia in 2003-04 with an aggregate of 464 runs at 58, including a top score of 195 in the third Test in Melbourne.
There have been calls for his return to open the Indian innings after the inert batting displays of Rahul Dravid and Wasim Jaffer, which handed the initiative to the Australian bowlers in the Boxing Day Test.
Opener Rahul Dravid's painstaking innings of 5 and 16 from a total of 180 balls were a key factor in India's failure, with the tourists making just 196 and 161 to go down inside four days.
Sehwag's return to partner Jaffer would allow Dravid to revert to his customary No.3 slot with the out-of-form Yuvraj Singh (0 and 5) likely to give way if selectors make a change to the batting line-up.
Kumble spoke admiringly of Sehwag's credentials in his match-eve press conference on Tuesday but stopped short of saying whether the 29-year-old big-hitter would play in the New Year Test, the second of the four-Test series.
Australia can hold onto the Border-Gavaskar Trophy with a record-equalling 16th consecutive Test victory in the SCG match.
"We'll still think about it, we have time until tomorrow morning," Kumble said.
"There are a few things in the mind but I don't like to share it now.
"He (Sehwag) looked good from whatever we've seen in the nets.
"In terms of his form, we're not concerned too much. He's hitting the ball well and he's in the scheme of things.
"We'll assess the conditions. He brings in that attacking, positive approach."
Kumble said he had advised Dravid, the 34-year-old veteran of 116 Tests with 24 centuries and an average of 55.45, to relax more during his innings.
And the Indian skipper is demanding his team-mates lift their intensity after some embarrassing batting and fielding efforts last week.
"It all boils down to going there and fighting. We didn't show a bit of that in the last game, but we're looking to do that," he said.
"It was more to do with relaxation. I thought all the batters who played in the last game were a bit uptight. We got together for the New Year's Eve and spoke about it."