Born in Morocco, Ezzalzouli moved to Spain with his family at the age of seven to live and started his football youth career in the neighborhood of Carrús, in the city of Elche.

[4] Hércules B coach Antonio Moreno Domínguez offered him a contract, and Ezzalzouli subsequently joined the club in the neighbouring city of Alicante, and began his senior career with the B-team in 2019.

[10] On 4 September, he made his first appearance for Osasuna against Rayo Vallecano after being subbed in the 81st minute, he managed to assist the winning goal in that game, which ended in a 2–1 victory.

[15] On 1 September 2023, Ezzalzouli signed a five-year contract with fellow La Liga club Betis,[16][17] with the transfer being reportedly worth €7.5 million, plus a buy-back option in favor of Barcelona.

[32][33] In June 2023, he was included in the squad for the 2023 U-23 Africa Cup of Nations, hosted by Morocco itself;[34][35] named as the team captain,[36] he went on to score three goals[36][37][38] and three assists in four matches,[36] as the Atlas Lions won their first title and qualified for the 2024 Summer Olympics.