Arsenal made the announcement on their official website.
The Technical Director of Arsenal, Edu expressed his delight that they have completed the transfer with Sao Paulo.
Edu said " We're delighted to have completed the transfer with Sao Paulo, as Marquinhos was a player we had been watching for a while. At 19, he is still very young, so he is a player for the future. We look forward to Marquinhos now joining us for pre-season, making his new home and continuing to grow and develop with us"
Gunners manager Mikel Arteta began tracking the Sao Paulo youngster several months ago after being alerted to his exploits in Serie A.
And the Spaniard has pulled the trigger on signing the 19-year-old, forking out £3million to acquire his services.
Italian journalist Fabrizio Romano relayed the news, tweeting: "Deal finally signed between Arsenal and São Paulo for Brazilian winger Marquinhos.
"Everything completed on a permanent deal, €3.5m fee.
"Contract agreed until June 2027 for Marquinhos, born in 2003 and now set to be announced as new #AFC player."
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