A left-handed batter and an occasional left-arm spinner, Mominul Haque made his first-class debut for the Dhaka Division in 2008 and the following year, emerged as the leading run-scorer against Zimbabwe Under-19 in 2009. Mominul was also part of Bangladesh's Under-19 squad for the 2010 U-19 World Cup, held in New Zealand. The youngster was called-up to the national squad in 2012 for their ODI series against the West Indies, where he replaced his favourite cricketer, the injured Shakib Al Hasan.