Jamie Carragher believes David Luiz has no future at Arsenal after he was sent off in a 3-0 loss to Manchester City .
Luiz has struggled to impress since moving to the Emirates from Chelsea, giving away four penalties so far this season - the joint-most by a single player in one Premier League campaign.
On Wednesday against City, the Brazilian also became the first player to be sent off , concede a penalty and commit an error leading to an opposition goal in a Premier League match since Carl Jenkinson did the same for West Ham in August 2015.