That is the view of former Chelsea and Manchester United manager Jose Mourinho, who thinks that the Brazilian will have something to prove at the Emirates.
Luiz sealed an unlikely move to Emery’s Gunners on transfer deadline day for £8m.
Arsenal fans have been crying out for defensive reinforcements for a long time and the hope is that Luiz and other new boy Kieran Tierney can make a difference.
Luiz won everything at Chelsea, including the Premier League and Champions League, but is known for his erratic defending when he is not on his game.
Jose Mourinho thinks David…