All-rounder:

Shakib Al Hasan
Despite suffering from a sympathetic finger injury, Shakib Al Hasan decided to play in the Asia Cup 2018 after a lot of discussion with the physio and team management.
Thus, he will surely be aiming to help Bangladesh with both batting and bowling.
Spinner:

Mehidy Hasan Miraz
Miraz has not played so many One Day Internationals yet but he can be a dark horse for Bangladesh in the forthcoming tournament.
He grabbed three wickets in the recently concluded three-match ODI series against West Indies and the spinner was quite economical with the ball.
However, the selectors have included another spinner, Nazmul Islam Apu in the 16-man Bangladesh squad. But he is not likely to get a chance in the first match against Sri Lanka.
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