Najjarine signed his first professional contract with Melbourne City on 18 July 2017, penning a three-year scholarship deal with the club.

[2] He made his first appearance as a second-half substitute in City's 2–0 loss to Brisbane Roar in Round 5 of the 2018–19 season.

[3] In late-April 2019, Najjarine scored his first goal for Melbourne City in a 5–0 win over Central Coast Mariners at AAMI Park.

[5] His first goal for the club came on 16 March 2022, helping his side beat Adelaide United 2–1 away from home.

[6] Najjarine played 36 times for the Wanderers in all competitions, before departing the club on a mutual termination mid-way through the 2022-23 season.