Renato Sanches deal: €35m guaranteed. €5m for every 25 appearances until 2021 (max amount is 25 mil€). €20m for Ballon d'Or shortlist/FIFA Team of the Year.
So 125 games during 5 years and ballon/fifa team shortlist. If he turns out to be any good, they'll pay the whole amount.
80m for a 18yo with 6months of professional football.