In March 2016, the two clubs reached an agreement for a one-season loan to Lille, where he played for the reserve team. He made 26 appearances for the B team, scoring one goal.
In 2017, he signed his first professional contract with the Lille club, on a five-year deal running until June 30, 2021. Mendyl made his professional debut on February 18, 2017, on the 26th matchday of Ligue 1 against Caen, coming on in the 79th minute in a 1–0 victory. He made his first start in a Coupe de France match against Bergerac on March 2, 2017.
On October 21, 2017, on his birthday, his coach brought him on in the second half of the league match against Rennes, where he received a red card in the 87th minute.
At the beginning of the 2017–18 season, he established himself as a starter for Lille, but he was soon the subject of interest from major clubs during the opening stages of the summer 2018 transfer window, including Arsenal, PSV Eindhoven, and Schalke 04.
During the summer 2018 transfer window, English club Arsenal showed interest in the young Moroccan talent. German club Schalke 04 also considered signing him to play on the left flank, where the long-term absence of Bastian Oczipka, who had undergone surgery for a groin injury, had created a problem. Lille, under pressure from the financial control authorities, eventually decided to sell the Moroccan international, who joined the German club on August 17, 2018, signing a five-year contract for a transfer fee of €7 million.
On September 15, 2018, Domenico Tedesco decided to start Hamza Mendyl in his first appearance for Schalke 04, in a match against Borussia Mönchengladbach. After a disastrous start marked by several harsh tackles and having already received a yellow card, the coach decided to substitute him in the 25th minute, bringing on Alessandro Schöpf instead. Schalke went on to lose the match 3–1. In his second match, he was again named in the starting lineup alongside his Moroccan national-team teammate Amine Harit in a game against Freiburg, playing the full 90 minutes in a 1–0 defeat.
On October 3, 2018, he started his first UEFA Champions League match away against Lokomotiv Moscow, playing the full 90 minutes in a 1–0 victory. In December 2018, the player suffered an injury during a league match and was sidelined for two months.
On February 21, 2019, he returned from injury by starting in the Champions League round of 16 against Manchester City. During the match, he was deployed as a center forward, despite being a natural left-back. The match ended in a 3–2 defeat at home.
Dijon (Loan)
On 21 August 2019, he was loaned to Dijon for one season with an option to buy. His devastating dribbling and offensive contribution made him an undisputed starter in his position during his only season at Dijon, where he competed with Ngonda Muzinga for the spot. His main weaknesses were defensive, as evidenced by the 7 yellow cards and 1 red card he received in 20 appearances in all competitions.
He scored his first professional goal against Toulouse on matchday 28 of the league, in a 2–1 victory for his side.
He returned to Schalke 04 at the end of his loan spell.
Aris Thessaloniki
On 16 January 2025, Mendyl signed a contract with Aris Thessaloniki in Greece until 30 June 2026, with an option to extend for an additional year.
Mendyl married Moroccan Instagram star Maroua Ourahali in late 2018. They had their honeymoon in the Maldives and now have a son together called Cayden, who was born on 20 February 2020. Hamza is a close friend of fellow footballer Amine Harit.[citation needed]
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