It may come down to the wings.
On the other side, Manchester City have any one of Gael Clichy, Aleksandr Kolarov and Pablo Zabaleta to choose from, with Bacary Sagna sidelined due to injury.
Knowing this, Guardiola may just opt for a back three formation from the start, looking to pin Barcelona back and use that numerical advantage to, in Guardiola's words, "full-court press" their opposition.
Bayern Munich may have gotten them to switch it up a bit last year, but they were still the same Barcelona they always are, and they'll probably be the same Barcelona against City.
It remains to be seen if it matters in the end for this fantastic collections of players and coaches.