Some of these lads don't know how to win big games or how to deal with pressure.
You look at United or Chelsea etc
Some of these guys are under insane pressure, he's not giving some of them any time, this is it for them, they need to shine now, they need to treat every game like it's a final.
I mean how are some of these guys expected to play when they know Mancini hasn't any faith in them and doesn't rate them, they can't make a single mistake. It's not like the likes of Tevez or Hart, no matter how many mistakes or what bad form they hit, they'll always get their game. That's a lot of pressure and some players aren't used to coping under that kind of perssure when they know that can't afford to make a mistake.