Catch up on all the stats and storylines you need to know about ahead of one of the biggest ties of the round of 16 in the Champions League. Luis Enrique liked to rotate during his three years at Barcelona but he knew his best XI when it was mattered. In fact, it was so nailed on that the Catalan press ended up using the term "Gala XI" when he sporadically rolled it out, usually on the big Champions League nights or in Clasicos against Real Madrid. Ernesto Valverde doesn't like rotating as much and prefers working with a much smaller squad, but it's not clear if he knows his best XI just yet.