4. Ronaldo to Inter Milan, 1997 – £20.4m
A huge fee at the time, the Brazilian would go onto be considered one of the finest strikers ever after winning the 2002 World Cup and netting 15 goals in total at four different tournaments.
Ronaldo would return to La Liga in 2002 upon joining Barca’s ‘El Clasico’ rivals Real Madrid as part of their ‘Galaticos’ policy at the Estadio Santiago Bernabeu.