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Mastour was signed by Milan as a 14-year-old from Reggiana for a reported fee of €500,000 (£408,000) in 2012.
Helped by the seal of approval from legendary Milan and Italy manager Arrigo Sacchi, the Rossoneri beat the likes of Real Madrid, Barcelona and Manchester City to draft him in.
Mastour had scored five goals at the Ielasi Memorial tournament and there was serious hype surrounding him after YouTube compilations of him garnered five million views.
But Mastour, the youngest player to turn out for the Moroccan national team in 2015, failed to make a single appearance for Milan.
He made the bench under Clarence Seedorf in 2013/14 and was on the verge of breaking Paolo Maldini's record for the club's youngest ever player - although he was not brought on in the 2-1 win against Sassuolo.
In fact, his only notable action at Milan was that former manager Gennaro Gattuso threatened to "knock his teeth out" if he didn't buckle down.
It seems he wasn't quite able to do that as Milan was loaned out to both Malaga and PEC Zwolle in an attempt to get extra game-time. Yet across the two stints, Mastour played just seven times.
In 2018, after his Milan contract had expired, Mastour's next career move took him to Greece, signing for Superleague side Lamia.
It was hoped that this change of scenery could get Mastour back on track and he was said to be earning €200,000-per-year.
But it was deja vu all over again. He played just six times in a seven-month period and failed to find the net, leading to his contract being terminated by mutual consent.
Then came a return to Italy with Serie C side Reginna, who he signed for on a three-year deal, but a second mutual termination arrived.
He spent the second half of the 2020/21 season on loan at Carpi, where he played 10 times and scored his first ever professional goal.
Now, though, the 24-year-old has signed for Renaissance Zemamra in his ancestral country of Morocco after a year off.
This not an April fools joke, ex-wonderkid Hachim Mastour has signed with Botola Pro 2 side RCA Zemamra.— RedDevilJoseph🇲🇦 (@RedDevilJoseph) June 27, 2022
The 24 y.o winger who was once deemed the biggest talent in AC Milan and a future great for the Atlas Lions, now finds himself in the Moroccan 2nd division. https://t.co/f4zRNL06CV
RCA play in the second division and here's hoping this move will help Mastour rediscover his love for football.