Spain coach Vicente del Bosque admitted the reigning world champions will have be at the top of their game for the opening match of the group against Holland.
We're going to have to prepare ourselves from day one and get in the right frame of mind. They are going to demand everything from us. But it's up to us to perform, it's not just down to our opponents.
Holland have changed since 2010, especially in midfield and in defence. But they've still got Robin van Persie and Arjen Robben.
Chile have been playing very good football, which is very uncomfortable to play against, for the last few years. They are very strong at pressing, they have very intelligent footballers who are very skilful. They will be very difficult.