Nassiri started his career at Takht Jamshid Cup side Rastakhiz Khorramshahr, but it didn't last long as the club was shut down due to Islamic revolution.

[10] He was also part of the team that won Federation Cup in 1985 and participated in 1985–86 Asian Club Championship in Saudi Arabia,[11][12] under coaching of legendary footballer P. K.

[19] He managed the club from 1998 to 2001 and helped them winning the Rovers Cup alongside Mumbai Super Division league in 1998.

In 2003, Nassiri was appointed as technical director of Wari Athletic Club, which was then promoted to Calcutta Football League Super Division.

[23] In June 2022, Nassiri acquired post of technical director in Peerless ahead of the new season of Calcutta Premier Division League.

[28] Nassiri is married to Susanne, who is born and brought up in India, and lives in Queens Mansion on Park Street.

[29] His younger son Kiyan is a professional footballer (born 2000) currently playing for Indian Super League side Chennaiyin FC.

[30][31] Kiyan began his youth football career in CC&FC – where Jamshid served as coach,[32] and appeared with Mohammedan.