After learning of Frank Lampard's "different ideas" for Chelsea, David Luiz chose to pursue a new challenge at Arsenal.
Arsenal have the players to help make the club "shine" once again, says new signing David Luiz.
Unai Emery has made three changes to his Arsenal side, including David Luiz in the starting XI for the first time.
Chelsea's decision to sell David Luiz was based purely on footballing terms, according to head coach Frank Lampard.
Shkodran Mustafi and Unai Emery held talks about his Arsenal future even before David Luiz's arrival from Chelsea.
Arsenal's recruitment team were busy in the close season and the club are expecting to see a few more faces leave in the next three weeks.
David Luiz did not refuse to take part in training prior to his shock deadline-day move to Arsenal, according to Chelsea boss Frank Lampard.
Arsenal's late transfer-window move for David Luiz means the Gunners and Chelsea will have key decisions to make with their line-ups.
Inter got Romelu Lukaku, Arsenal signed Kieran Tierney and David Luiz and Alex Iwobi should go to Everton, who could not get Wilfried Zaha.
David Luiz has been a familiar figure at the heart of Chelsea's defence, but the Brazilian has reunited with Unai Emery at Arsenal.