Sorry? What else does Chalobah need to do exactly to be worthy as a squad option?
He performed in the Super Cup. Did extremely well in the EFL Cup final and put in a MOTM performance in the FA Cup Final.
He's never injured, can play across the entire back 4 (even at DM if needed), and has always put in a good shift when called upon (excluding the shambolic management of Lampard and Potter).