Eden Hazard has told SFR Sport that Chelsea players can play with their eyes closed due to the intensity of Antonio Conte's tactical training.
Conte's arrival in summer 2016 saw the Chelsea squad given extended training sessions that focused on improving their tactical understanding.
After an unconvincing start to last season, the former Juventus and Italy boss' switch to a back three sparked an upturn in form that saw Chelsea lift the Premier League title.
"We work a lot," the Belgium international said. "It's not always easy in training, there are a lot of hours of training, but it bears fruit on the pitch.