The striker has joined on a long-term contract for an undisclosed fee, believed to be around £6million.
The Gunners have been tracking the 18-year-old for some time and reports as early as March suggested they had won the race for his signature, while a number of other European clubs were tracking the forward.
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Martinelli played for Brazilian club Ituano who are based in Sao Paulo. He made his debut for the club in 2017 at the age of 16.
Gabriel Martinelli’s first day at Arsenal:
He went on to score 10 goals in 34 appearances.
The 18-year-old’s performances have attracted attention from the Brazil national squad and he was called up to the full squad for a training camp in May ahead of the Copa America.
On Tuesday, Arsenal announced the long-anticipated signing of 18-year-old Brazilian forward Gabriel Martinelli from São Paulo-based club Ituano. (Not coincidentally, it comes just a day after the club unveiled its new Adidas kit.)
Martinelli will be a relative unknown to most fans of English soccer since he’s spent the entirety of his young career in Brazil. So here are a five things fans should know about the newest Arsenal lad.