In the 2017-18 La Liga season Real Madrid scored 94 goals, but this was down to 63 in 2018-19 as Los Blancos went through multiple managers. Julen Lopetegui, Santiago Solari and finally Zinedine Zidane all attempted to make up that 31-goal void, but could not magic goals out of nothing.
Coincidentally, but also tellingly, 31 was the number of goals Cristiano Ronaldo was involved in during his final league season in Madrid, scoring 26 times and assisting on five more goals.
Mariano Diaz was bought for €30 million (£27m/$35m) and inherited Ronaldo's number seven shirt, but had none of the traits of the five-time Ballon d'Or winner, finishing the season with just three league goals.