Alli has developed into one of the Premier League's top goalscoring midfielders during his time at Tottenham, and scored 14 goals in all competitions to help Spurs to a third-place finish in the 2017-18 campaign.
England have been drawn in Group G along with Belgium, Panama and Tunisia at the finals.
"The main thing is to believe it can be different", he said at England's media day on Tuesday.
"I think the pace in the team you can feel it. You've got plenty of big grounds around the country with thousands of people wanting to watch".
Martyn never played at a World Cup and was 33 by the time he made his first appearance at a major global tournament during Euro 2000.
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Henderson agrees with skipper Kane's view that England must adopt the mentality that they can win the World Cup, even though he is scarred by the experiences of his three previous tournaments - the Euros in 2012 and 2016 which sandwiched the World Cup in Brazil four years ago.
But Stoke's Jack Butland and Burnley's Nick Pope are also in contention.
Though the Everton man is set to be rested for the final World Cup warm-up game against Costa Rica at Elland Road on Thursday, he is expected to continue in goal when England begin their campaign in Russian Federation.
Stoke City's Jack Butland is another jostling for position with Pope, allocated number 23, who will hope to make his worldwide bow in Thursday's friendly against Costa Rica at Elland Road. It's really tough. There's a lot of good teams that don't make it.
Do you agree with Dawson's England XI?
"For the players, whoever Gareth chooses, it's quite important to know where they stand", Martyn said. "He can be very pleased with his performance".