"India will probably be the favourites for this tournament. But all teams will come here believing they can win this tournament," said Williamson at the pre-tournament media conference after the team's first training session at the Wankhede Stadium here.
"I think being the favourites, they are certainly a team that will be tough to beat (in) the competition. They have got a number of players who can win the matches. That's part and parcel of having a good short format side and so that's certainly what the Indian side have," Williamson added.
"We have a tough match first up. We will be preparing as well as we can for these conditions. It will be great to get a good start (against India), so that we can carry the momentum forward into the tournament," Williamson, who will be playing in his third World T20 tournament, said.
He said it would be crucial to adopt plans against different opponents.
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Williamson, who has succeeded Brendon McCullum as captain, said the team was in a transitional phase after the retirement of the aggressive wicketkeeper-batsman and stressed that they needed to play smart cricket as per the conditions in the country.
"It's important we adapt and play good and smart cricket. Cricket can be quite different in these conditions. We need to prepare well. Coming here things will be a little bit different. We need to be smart.
Ahmedabad in 2010 against India, said it was important to use the inputs of those players who have played in the IPL.
"A lot of guys have played a lot of cricket here. It's important to tap into their experience. It will certainly help our cause. A lot of them have played alongside a lot many international cricketers."
He said that while spin bowling will be an important part of the tournament, seam bowling would not be left behind.
"Yeah, especially when you come to India you assume that the ball will spin on some of these surfaces. We have got some young, exciting spinners and they will be looking forward to bowl. Spin is likely to play a part, but I have no doubt that seam will also play a big part and we have world-class seamers in our line-up. They are all fit," said Williamson.
On the issue of corruption in the game, he played safe.
"Education around those issues is there. You go to at least one seminar every year and everyone's well educated. As far as our side is concerned, we are just excited to come here to play in a great tournament like this T20 World Cup.