[3] Following the bout, one month after his professional debut, Khoumari defeated British Boxer Jamie Speight, winning a points decision (PTS) through four rounds.
[6] Khoumari moved up one division, to super lightweight, and defeated British veteran boxer Kristian Laight via a points decision (PTS) through four rounds.
[7][8][9] On 8 September 2018, more than five months after his victory against Laight, Khoumari defeated British boxer Michael Mooney via a points decision (PTS) through four rounds.
[20][21] Khoumari extended his winning run to ten matches by defeating British veteran boxer Lee Devine via a Round 3 (TKO).
[27][28] Six months later, it was reported that Khoumari was scheduled to face former super featherweight world title contender Vicente Martín Rodríguez on September 11, 2021 in Barcelona, Spain.