Brazilian defender linked with a return to Stamford Bridge.
Forward becomes Arsenal's third capture of the summer.
Hart could join Serie A side on season-long loan, while team-mate Samir Nasri could also be on his way.
After a quiet summer at the Emirates, Arsenal set for double swoop.
England number one not on Everton's radar, says Koeman.
Arsene Wenger can offer guarantee of Champions League football to striker.
Money is there and will be spent, insists beleaguered Wenger.
Leicester receive a boost as last season's PFA Player of the year signs a new deal.
Arsenal target may now be on Liverpool's radar.
All the summer transfers from the Big Five European leagues.