ARSENAL manager Mikel Arteta has backed calls for concussion substitutes to be introduced in football.

The Gunners boss saw defender David Luiz involved in a sickening clash of heads with Raul Jimenez on Sunday which left the Wolves striker with a fractured skull.

Luiz played on until half-time, with Arsenal insisting all concussion protocols currently in place were followed, but was replaced as blood continued to seep through his bandaged head.