"Jaker Ali suffered a concussion while batting in practice yesterday [Sunday]," Bangladesh's physio Bayjedul Islam Khan said. "He has a history of concussions and is still showing symptoms. Given his previous concussion record, recovery may take some time. Based on the clinical findings, he has been ruled out of the second Test."

He has also played 19 T20Is, having made his debut in the format earlier this year.

This is wicketkeeper-batter Mahidul's maiden call-up to the Bangladesh side. He has played most of his first-class matches for Dhaka Division, hitting all three centuries for the NCL team. He has also played one game for Bangladesh A against Pakistan A in August this year.

Earlier the selectors also called up pace bowler Khaled Ahmed to replace Taskin Ahmed.