Shastri addressed the media before Team India's departure for England tour.
Ahead of the departure, India head coach Ravi Shastri said the WTC final should be a best-of-three affair going forward and not a one-off match like his side is due to play against New Zealand in the inaugural edition.
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"I think ideally, in the long run, if they want to pursue with this Test championship, best of three final would be ideal. A three match series as a culmination of two and a half years of cricket," Shastri said in the pre-departure press conference.
"But they need to finish off the Future Tours Program (FTP) and then start all over again. So one off is one off, guys have earned their stripes, and this is not a team that is suddenly blossomed overnight," he added.
While Team India will serve a stern quarantine after landing in UK, New Zealand are already getting valuable practice with the two-match series underway against England.
Terming the WTC final a massive game, Shastri said: "See, it is the first time that you have a Test Championship final. When you look at the magnitude of the game that's going to be played, I think this is the biggest, if not the biggest ever, because it's the toughest form of the game."
"It's a format that tests you. It's not happened over three days or three months, it's happened over two years, where teams have played each other around the world, and earned their stripes to play the finals so it's one heck of an event," he concluded.
(With PTI inputs)