I wouldn't keep Palaversa, he's been terrible since joining (cup final aside). I'd keep Polvara for his utility. Agreed on the others. Milanovic is quick, but not over ten yards, which is why he's setup as inverted. Looks to me like he'd be far more of a threat centrally, but needs a loan move, as he presently isn't any better than Ryan Duncan was. I don't think he's suited to ten minutes here and there.
Personally, I'd do as deep a purge as we can. Look to get around seven or eight out the door (I'd include Clarkson as it's fairly clear he doesn't want to be here, even if it means we miss out on his obvious talent). I think any manager would want to go even further than that in the summer, so might as well make a big dent in it now.
Ambrose
Yengi
Karlsson
Molloy
Gyamfi (probably)
Clarkson
Nilsen
Palaversa
Milanovic (loan)
Sokler
Besuijen
On the assumption that one or two won't be shifted.