The hardest working player in Europe is going to form the base of the midfield in a team managed by a guy whose entire football philosophy is that hard work is more important than raw talent. Maybe it doesn't worry you people, but it should. Conte is the best manager in Premier League, and possibly Europe, based on what I've seen in the last few years, and Kanté is the perfect player for him. It's the kind of ideal match that almost never happens. They could both still flop for a magnitude of reasons, but it's far more likely that they won't.
