Things have been changing really fast in the last couple of years in the football world and nowadays most clubs use all kinds of tools at their disposal. Some examples I can think of: GPS technology to track the training sessions, relying on OPTA to provide detailed statistics about matches/opponents/players and even using the database of a game such as Football Manager for their scouting network. Rafa Benitez is an example of a coach who takes it one step further but there a loads of other coaches who rely heavily upon statistics. It's an industry where there are still a lot of opportunities for entrepreneurs.