Apart from the 10 teams, Blasters had to battle it out against the COVID-19 pandemic and controversial refereeing.
Blasters beat Jamshedpur FC 2-1 on aggregate in the semifinals. This is the third time lasters are entering the final. They were runners-up in the inaugural season in 2014 and in 2016.
Blasters won 1-0 in the first leg, riding on a Sahal Abdul Samad goal.
Fittingly, the winning goal came off the boot of a Malayali player (Sahal Abdul Samad).
Kerala's defence was rock-solid too, withstanding the initial threat from Jamshedpur with Marko Leskovic leading from the front.
Blasters are in the semifinals for the first time since 2016 after finishing fourth in the table.
With one match remaining between them and ATK Mohun Bagan, the Men of Steel have to avoid defeat to become winners of the league stage.
Skipper Peter Hartley and the in-form Daniel Chima Chukwu were among the scorers in a 3-0 win
Jamshedpur defeated NorthEast United 3-2 in the Indian Super League.