Clavering is only in his first year at u19s, has got the size , needs bit of work on mobility and fitness but that will come with time at that level.
Masi is a big unit too but he's now going to be stuck in the over age problem. Club should get him to sign for a NL club for year or 2
Bower won't make it for me, decent defensively but not hot the look of a SL centre, struggles to find his winger of score enough himself IMHO.
Bit lower down a few names to watch in a few years are Bobby Downs (first year academy), Jack Brown, Robbie Storey, Callum Tranmer who are in scholarship.
Then we have year one of the City Academy to watch next year, now these kids I know a lot about but I won't name them yet