Bangladesh Cricket Board physician Manzur Hossain told AFP that the 24-year-old fractured his right little finger during a domestic match at the weekend.
"The X-ray revealed a fracture in his finger. Usually it takes around four weeks to recover so he is definitely ruled out of the first Test and is also uncertain for the second Test against Sri Lanka," said Manzur.
The first Test is scheduled to start from 15 May. The second Test will be held in Dhaka from 23 to 27 May.