when managing AC milan i bought Rafnha from schalke for somewhere around 14 million in january of my first season. by end of the season Real madrid offered me 23million for him. Naturally I rejected their offer.
I would go for Van Der Wiel from Ajax usually u can get him on the cheap for about 11m depending on what season you are in Im currently in my third with Arsenal n signed him amazing buy consistent perfomances n kept sagna out of the team for a long time even though i bought him as back up. I would recommend him only downside is he suffered two long term injuries in his debut season but still averaged an rating of 7.35 seen to be more of an attacking right back
diego renan is so overrated, he never gets above 6.9 rating for me on any saves. Dont know why people always rate him, otamendi to, he's always substandard.
keep Neville he becomes a good back room staff member with high stats when he retires so for now use him as a back up or put him in the reserves. also don't sell him as you wont even get a bean for him.