It is no secret the Gunners have been keeping close tabs on the talented forward, hoping to add him to their ranks for the 2013/2014 season.
That looked a very difficult task when Adrian was one of key players at Vicente Calderon in the opening exchanges, but he has since lost his place in the side to Diego Costa.
With the Brazilian establishing an excellent attacking partnership with Radamel Falcao, Atletico Madrid officials have decided to cash in on Adrian in the summer transfer window.
This has been great news for Arsenal, who could sign him for as little as £8.5 million at the end of the current campaign.
Arsene Wenger is eager to close the deal as soon as possible seeing as how Tottenham, Liverpool and Everton are also keen.