I don't get this, although my definition of realistic might be different. There seems to be a lot of options out there although no sure fire, no doubt option, although I am not sure there ever is.
"Hot" young progressive European options:
Nagelsmann, Ten Haag, Jardim, Kovac, Hutter
Young, "progressive" English options:
Potter, Parker, Howe, Frank (I know not English but in English League)
Experience PL managers:
Rodgers, Hassenhutl
Experienced Managers out of work:
Benitez, Allegri, Sarri, Bosz, Favre
Wildcard:
Gerrard, Bielsa
I certainly don't want every one of those guys and some probably aren't options but there seems to be a lot of guys and different kind of managers out there that could be options.