"Bangladesh pace bowler Mustafizur Rahman has suffered a side strain and will not play any further part in the Micromax Asia Cup T20," a BCB release stated.
A Grade I side strain can also make him a doubtful starter for Bangladesh's World T20 qualifying round matches against the Netherlands and the Ireland in Dharamsala.
Team physio Bayjedul Islam Khan: "Mustafiz complained of discomfort after Sunday's match against Sri Lanka. An MRI scan was done today and the report from the radiologist confirmed a Grade-1 side strain on the right. He is under conservative treatment and rest for next 48 hours. Following that the rehab will begin. We are expecting that he will make a quick recovery and resume bowling soon."