Davies is PL battle hardened and has the drop on Klaassen in that respect as he's coming from a poxy league.
Great, then he'll play on merit, and have the ability to be rested for random European games due to squad depth. And if Klaasen comes good, then we've got a great player in. It's win win, I don't see the problem.
Indeed, I'd see it as a much bigger problem if we hadn't have bolstered that position.