Schurrle was very solid last season and he can improve on that. But he can't improve for Chelsea if he sold at the first sign of weakness. Besides if the Club sold all players that had a slump, Drogba would have been gone years ago, Lampard was average till Mourinho came along, Branislav didn't even play for an entire season when he joined, Nemanja Matic was hocked and now he is the best DM in the world. I'm not saying that Schurrle is going to be amazing but I will say that he has the potential to be amazing. He isn't a starter and probably never will be as long as Hazard is healthy, it must be said.