Bolavip Brasil says Donelli, 19, has Jorge Mendes as his agent and his representatives have pitched the highly-rated goalie to the Gunners via a scouting report.
The Gunners have been watching Donelli for a year and now have the chance to land him.
Arsenal legend Edu is the North London club's technical director and a 19-page scouting document was sent his way in an attempts to lure an offer.
Edu, 43, was previously at Corinthians, both as a player and a director of football, and likes to keep tabs on his ex-club.
Donelli has represented Brazil at youth level, winning the U17s World Cup in 2019.
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