Mahmudullah Riyad complained about Bangladesh's inability to thrive under pressure in the 20-over format after succumbing to a 30-run defeat to India in the final T20I of the three-match series.
Bangladesh found themselves in a solid position at 110-2 while in pursuit of the challenging 175-run target but it all fell apart spectacularly when Deepak Chahar dismissed Mohammad Mithun to spark a dramatic collapse.
Mahmudullah, who was handed the captaincy baton in the absence of the suspended Shakib Al Hasan, conceded that senior members of the side were guilty of playing false strokes.
"If you analyse these three games, we played good cricket. It is hard to get the momentum back once you lose it in T20 cricket," Mahmudullah was quoted as saying by the ICC.
"As I have mentioned, we were very close in this game. We lost three or four wickets in six or seven balls. It was a crucial part of this game. We can't make these mistakes again and again," he added, ruing the latter half of Bangladesh's innings.
The 33-year-old batsman implored his team to swiftly learn their lessons and shoulder responsibility to close out chases more efficiently.
"We had our chance when we needed 50 runs off 30 balls, but we lost a few wickets rapidly. It cost us the match.
"Our game sense needs to improve and we need to become more consistent mentally. So as a batting unit, if we can improve then we will have more chances to win."
Bangladesh had entered the final match with the series level at 1-1 as Mushfiqur Rahim's batting heroics in the opening game helped them achieve their maiden win over India in the shortest format.
They dominated a major chunk of the proceedings on Sunday courtesy of a dazzling knock from 20-year-old Mohammad Naim, who heralded his side's chase with 81 from 49 deliveries.
Naim's 98-run stand with Mithun was the sole silver lining for the visitors' batting before Chahar ran riot with the ball and registered record bowling figures of 6-7 including a hat-trick.
The consistent failures of Soumya Sarkar and Liton Das in the top-order has thus given rise to calls for revamping Bangladesh's batting combination but Mahmudullah stressed the need to back their prominent players.
"It is important to back players in T20Is where it is hard to be consistent. As a team and the management, we should back players who are going through a rough time," he said.
Another area of concern for Bangladesh has been Mustafizur Rahman's dwindling form as he managed just a solitary wicket across the three games.
On the contrary, Shaiful Islam and Al-Amin Hossain were impressive and filled in the void created by the left-arm seamer's ordinary outings.