"You go for training, you come back to the room, you go to the gym and you come back to the room. It becomes very difficult for the players," he said of the experience.
A bereaved ATK Mohun Bagan goalkeeper Arindam Bhattacharya said that his mother has died after battling COVID-19.
The AFC did not give any reason but asked the participating teams to either return home or not to proceed to Maldives for the matches.
Under the AFC protocols, competing players will have to have COVID-19 negative reports two days before departure from their home base.
The 22-year-old will join the Mariners with effect from June 1. Liston, who joined the club in January 2020, made 23 appearances for Hyderabad FC in the ISL scoring four goals.
The former India cricket captain expressed his appreciation on the success of an uninterrupted ISL, terming it a new benchmark for the Indian sports industry.
What a season it has been for the Islanders. They became only the second club to win the League Winners Shield and the ISL trophy after Bengaluru FC.
Both clubs came into the final with identical records, 12 wins and just 4 defeats in the league stage.
While the game not only features big-name players, it is also a battle between two tactically astute managers employing vastly different footballing philosophies.
The Indian Super League will conclude on Saturday with the title clash between Mumbai City FC and ATK Mohun Bagan here.
The final of the seventh season of the league will be played on Sunday between ATK Mohun Bagan and Mumbai City FC in Margao, Goa.
They had a point to prove in the second leg and the Mariners came up with a performance to remember. They showed their attacking side with goals from David Williams and Manvir Singh.
Idrissa Sylla's injury-time equaliser helped NEUFC hold ATK Mohun Bagan to a 1-1 draw in the semi-final first leg on last Saturday.
"Talking about Saturday's game, ATK Mohun Bagan is a team with quality. It is going to be the toughest game in the league for us," NorthEast United FC interim coach Khalid Jamil said.
This was the first time in ISL history that the final league game of the season came with such high stakes as it was a virtual final between two teams who have been in a league of their own.