Gerard Pique v Sergio Aguero
If Manuel Pellegrini’s expensively assembled outfit are to stand any chance whatsoever of overturning the 2-0 deficit from the first leg in the north west last month, then they will need their inspirational Argentina international to be fit and firing on all cylinders at Camp Nou.
The diminutive front man has been in razor-sharp all campaign long, however, the 25-year-old’s season has also been badly disrupted by several untimely injuries too, including his most recent problem that crucially kept Aguero out of the first meeting at Eastlands.
But the man charged with stopping Kun is Barca’s silky-smooth Spain international, a centre back who has experience of trying to quell some of the world’s most deadly marksmen over the years.