[3] While studying in Motijheel Ideal High School, Mohsin got a chance to practice with Dhaka Second Division club Railway Blues at the Shahjahanpur ground in his neighbourhood.

He caught the eye of Abahani Krira Chakra captain Ashrafuddin Ahmed Chunnu during the Sher-e-Bangla Cup, and joined the First Division club in 1979.

[5][6] Mohsin made his international debut against China during the 1982 Asian Games, replacing an out of favour Abdul Motaleb in the starting XI.

In 2023, a few years after his return to Bangladesh, his younger brother Kohinoor Islam, announced that Mohsin was not able to get treatment for his Dementia due to financial issues.

[15][16][17] Following this, Kazi Salahuddin, a former teammate and the president of the Bangladesh Football Federation, stated that he would provide TK 1 lakh to the ailing goalkeeper and would also pay for his treatment costs.