After regular skipper Shakib Al Hasan was suspended by the ICC for failing to report approaches by a bookie, the Bangladesh Cricket Board (BCB) had to make leadership changes for their T20I and Test squads for their India tour.
While Mahmudullah Riyad was named the skipper of the Bangladesh T20I squad, Mominul was appointed the leader for the Bangla Tigers in the longest format of the game.
The newly-appointed Test skipper said he was not aware why he was chosen for the role when the team has experienced seniors like Mahmudullah and Mushfiqur Rahim.
Mominul now plans to play his natural game as he used to do earlier.
"I never thought captaincy is any kind of extra pressure or responsibility because if I think that way then certainly it will be extra pressure. The way I've played before to score runs and play for the team, I am trying to play like that," he said.
"If I worry too much (about captaincy) it will affect me. If I think I have a lot of responsibilities as the captain and I have to pull the team forward then certainly it will create some pressure. And if I play as if I have to make runs for the team just as a batsman then probably it would not have the same effect," Mominul expressed.
Mominul will also become the first Bangladesh captain to lead his team in a Day-Night Test, slated to be held at the Eden Gardens in Kolkata from November 22.
"I think this is a great opportunity. We have not played a Test under floodlights or with a pink ball before, so we think this is a good opportunity for us. If we can play good cricket, it will be great," said the new skipper.