Arsenal have confirmed the signing of Brazil youth international Marquinhos from Sao Paulo.

The 19-year-old winger joins for an undisclosed fee having made 33 senior appearances for the Brazilian club, with whom he won the Campeonato Paulista last year.

Marquinhos scored twice for Sao Paulo and joins Arsenal on a long-term contract, with Gunners' technical director Edu revealing he is someone they have been keeping an eye on.

"We're delighted to have completed the transfer with Sao Paulo, as Marquinhos was a player we had been watching for a while," he told the club's official website.

"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."

Arsenal finished fifth in the Premier League last season.