Amid growing calls for Mahendra Singh Dhoni's ouster from the T20I side for failing to clobber the bowlers at the start of his innings, former India opener Virender Sehwag on Monday said the stumper should know his role in the team. "Dhoni should realise his role in the team. He has to change the momentum early while chasing a strong total. He has to score from ball one and the team management should make him understand this point," Sehwag told India TV news channel.