They'll be fine.
Kolarov gets beaten in the air a bit too much, but he reminds me a lot of Gareth Bale going forward and can see him developing into a quality full back.
Boateng hasn't really had a thoroughly convincing performance yet, but he hasn't been bad at all, he's just given a few too many fouls away.
They're getting used to the Premier League. I know it sounds cliché but it's true. Loads of managers use it for players who struggle, but when Mancini says it, he actually means it.
Plus, Zaba and Micah are there too who both have their own faults but are more than good enough to come in and do a job.
I don't actually see a full-back problem that some people on GMR were alluding to after the match.