Non of them being as good as a fit Höwedes. He had a season to forget, but at least we should try to extend the loan and see if he can stay fit.
Khedira has been mocked for being made of glass too, but now is probably among the players with most minutes played over the last few years. Won't hurt to keep him and see how things go, especially since Barza and Chiello won't be here forever.