I really like Digne, but it has repeatedly been mooted in the press (and I tend to agree) that the club can't really afford two high earners at left back. Digne is clearly the better player of our two left backs, but is nearly 33 and is at some point going to go into steep decline. With that in mind I am not that disappointed with the move. Maatsen has been an underwhelming player for us, and I would not be averse to also selling him if we can get a better first choice player in. Then we need a promising understudy from either the academy or elsewhere.
I assume at this point that Illing Jr is not good enough, so he needs selling as well.