Well it's interesting that he is not there and Hargreaves is, but I think he's still a year or two out from making his mark, he's just not physically developed enough yet. Maybe he'll go out on loan, or otherwise he'll definitely be involved in the Carling Cup, and probably the FA Cup matches as well.
Tosic is 22 and a serbian international, he may still have some adjusting to do, but could have easily been included in the champions league squad - i am sure kiko would have fit into the extra youngsters category and tosic could have been included.