Hearing Perez has been consistently useful the past two games, which is a nice development for them and potentially his long term future. Neither Mitro nor Perez look like the answer for next season, but the club could keep one of them to develop. If they were both on Jamie Sterry wages it's a no brainer, keep both; as it is it's only sensible to make better use of their high wages. Moving both on would be completely ruthless.
I'm sure Rafa's aware more than anyone of Marcos Llorente, he gave him his Real debut iirc, but this kid is the most obvious of signings for them next season. He's currently out on loan, has stated he loves Madrid but won't sit on the bench permanently, even with them. He's ripe for a move. He has Modric, Kroos, Casemiro in front of him at Madrid, maybe even Verrati next season. Newcastle can offer the challenge, wages, Spanish manager and set-up that suits him perfectly. He's going to the top as long as he avoids major injuries.