The 17-year-old has stated that he has penned a five-year deal with the Gunners.
The 17-year-old is highly rated in his homeland after breaking into first-team football at Arles last season in Ligue 2.
The creative playmaker has also starred for the France under-18’s side and is acknowledged as a young player with a big future in the game.
Bennacer has confirmed that he has agreed to sign for Arsenal, despite concerns about moving abroad.
"I was a little worried in my head about going abroad," Bennacer told L'Equipe.
"I have never left home before, I thought about staying in France in order to accumulate game time too.
"Arsenal is the most French of the English clubs.”
The teenager starlet also admitted that he has spoken with Arsene Wenger and that the Gunners boss was full of belief in his abilities.
"He [Wenger] told me that he was happy for me, that he thought I had the potential to succeed here," Bennacer said.
"It is up to me to prove myself, they gave me a five-year contract so they must have confidence in me.”
Arsenal have a history of signing French players from relative obscurity and turning them into world beaters, with the likes of Thierry Henry, Nicolas Anelka and Patrick Vieira classic examples.
The North London club have a wealth of exciting young talent coming through the ranks, with a handful of them getting a chance to impress in pre-season.
Bennacer will surely have to bide his time at the club before being considered for the senior team, with age-grade and reserve football on the agenda for the young star.