India crushed Sri Lanka 5-0 completing the formalities with a three-wicket triumph in the final match of the series last night.
"Guys being positive and aggressive rather than defensive and negative. So that's something we're really stressing on. Even if a bowler is getting hit, as long as he's looking to take wickets and not looking to get away -- that's the change we need," Kohli, who struck a 139-run knock, told reporters.
Stressing on the new-found aggression, Kohli said it was a challenging task to beat their sub-continental rivals so convincingly.
"It's not easy to have a whitewash especially against a sub-continent team in the sub-continent. It's always a very difficult thing so really glad the way the guys have responded to whatever I've asked of them. I'm really satisfied as a captain," he said.
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Reiterating his mantra of being ruthless, Kohli said: "I meant with ruthless, that we're looking to create wining habits more than anything else and create a culture for the team that needs to continue going forward as well."
"I can't comment on it right now but as long as we're strengthened in the middle-order I don't see any reason to keep batting at four. I've scored most of my centuries and won most of the games for the team at No 3.
"As long as I play the same way as I did today, that serves right for the team. You never know, I'm comfortable batting at No 3 and 4 both. I will go with my gut feel as well as what the team requires of me.