F
Flavia
Guest
Abidal was a fine player for Barca, but as a fullback, he contributed very little to the offense. Only Alves' extreme offensive orientation allowed Barca to have the other FB be so defensive. Having a FB/CB combo player on the squad again would add flexibility, but you need to be a very fine offensive player to be the regular FB on this team, especially if Alves leaves. I'm a big Bartra fan, but if he is going to have a second position on this club, I think DM would be more likely than FB. I have never seen him put in a cross, for instance. This is pretty high on the list of essential FB skills.
Alba is offensive. That's why Bartra at rb would have a similar role, as Abidal did. The combo Alves/Alba is leaving the defense exposed at times.