Nassirshalal was born on April 1, 1989 in Ahvaz and raised in Masjed Soleyman in the Khuzestan Province of Iran. He started weightlifting because of his father at the age of 15, out of the National Iranian Oil Company club in the oil-rich city of Masjed Soleyman.
Nassirshalal made his international debut at the 2006 World Junior Weightlifting Championships in the 94 kg category, where he placed fifth. He earned two bronze medals at the 2007 edition, as well as silver at the 2007 Asian Junior Weightlifting Championships. He also competed at the Asian Championships senior level that year, winning bronze in the 94 kg class snatch.
After skipping the 2010 season and switching to the 105 kg division, he next appeared at the 2011 World Weightlifting Championships, placing sixth overall.
A technical error in the clean and jerk portion, however, left him out of contention for any more medals at this tournament. He participated in the same event at the 2014 Asian Games and the 2015 World Championships, but failed to set a mark in the clean and jerk in both cases.
He began weightlifting at the age of 15 and has also won a bronze medal in the 94 kg class snatch at the 2007 Asian Weightlifting Championships, silver in the 94 kg clean and jerk and bronze overall at the 2009 edition, and gold in the 105 kg category in 2012. As of 2012 he is studying physical education at the Islamic Azad University Masjed Soleyman Branch and is coached by Kourosh Bagheri of the Iranian national team, a two-time Asian and 2001 World Champion in the 94 kg division. He won another bronze medal at the 2008 World Junior Championship before advancing permanently to the senior division in 2009, where he took silver in the 94 kg clean and jerk and bronze overall at the 2009 Asian Weightlifting Championships. He won his first international gold medal at the 2012 Asian Weightlifting Championships in the 105 kg snatch category. He was then selected to compete at the 2012 Summer Olympics in London where, despite competing with an aching knee, he won a silver medal in the 105 kg division, behind Oleksiy Torokhtiy of Ukraine.
He is a member of Melli Haffari Company Ahvaz Sports Club.
