Before the one-day series, the two teams played a two-match four-day series and both the matches ended in draw.
Left-handed top-order batsman Mominul Haque will lead the 2nd string Bangladesh side in one-day series, too.
Earlier, he also led Bangladesh A in the four-day series.
To play in the one-day series, five cricketers-- Abu Hider Rony, Ariful Haque, Afif Hossain, Saif Hassan and Mohammad Naim— reached Sri Lanka on Monday to join the Bangladesh A team.
Before flying for Sri Lanka, Afif told the media that he is eager to make his selection worthy in this series.
“I have been doing well for several age-level crickets for Bangladesh. I have also played in the Tri-Nation T20 series last month. Now, I have to prove my worth in one-dayers as well. I’m hopeful of doing well in Sri Lanka,” Afif told the media last Saturday.
The remaining two one-day matches will be played on October 10 and 12 at the same venue.