Philipp Max is an interesting one. On current form, he looks like the best creative LB in the top 5 leagues -- 2.9 key passes per 90 with 9 assists to show for it (not that it's necessarily a fair comparison, but Baines' best individual season totals were 3.1 key passes per 90 and 11 assists). It's unlikely that Augsburg would be able to resist a serious offer, especially given that they have only an outside chance of CL qualification.
Concerns are that the likes of United, City, and Chelsea are being linked (we can't compete if they're serious) and that he hasn't shown this level of performance before in his career. Also, as with most defenders we're linked with, I have no idea if he can actually defend.