Trying to work this out too, City twitter are saying Bernardo Silva will drop into LB

Bielsa's 3-3-1-3 formation - the tactics, how it works, the personnel he needs
There are suggestions that Bielsa is ready to make the switch to his innovative 3-3-1-3 formation at Leeds United this season
It's about Bielsa/Leeds but this formation Pep has used a number of times.