I watched clips of Sarri's Napoli to prepare - Barkley

Chelsea midfielder Ross Barkley tells Football Focus how he did his research on new Chelsea manager Maurizio Sarri's style of play in pre-season.

WATCH MORE: Worst moment of my career - Milivojevic talks penalty misses

Watch the full interview on Football Focus, Saturday 12:00 BST on BBC One and on the BBC Sport website.