We need to keep Carvalho in my opinion, just for one more season. I honestly don't think Bruma isn't ready yet to be playing 20 PL games a season. If Alex or Terry is injured, and Ivanovic is still covering for the injured Bosingwa, we need Carvalho to step in. Put it this way, I wouldn't want Bruma to be marking van Persie in a Chelsea-Arsenal derby for a short while. I have every faith in him but we have to be realistic with his progress.