argentina, you might be right about Lopez, but as far as Farinos, Mendieta, and Kily, I wouldn't bet on them leaving. Aside from each having huge release clauses:
-Farinos is Valencian and truly loves this team. I expect him to sign a new contract at the end of this season.
-Mendieta signed a multi-year contract at the end of last year (when several big clubs already wanted him) and has pledged to stay
-Kily is in his first year.
As for Cuper, I really doubt he'd leave, although I could understand if he did after what happened to him when it got nasty with the fans a few months ago. However, he has it made in Valencia and, in my opinion, would be stupid to leave when he has a team like this.
As for Gerard, he might. He's an excellent player, but not irreplacable (unlike Mendieta). Don't forget that we have Albelda, who is also a heck of a player.
About buying more midfielders, I'd say we can't have enough. Remember that not long ago, with all the injuries and suspensions, we were short of midfielders. Also, Milla might not play much next year.
I say we definitely need a world class left back because Carboni will probably play one more year and we have nobody to replace him.
We could also use a good right back, although Gerardo isn't bad at all.
Overall, I wouldn't be surprised if a few players leave (Lopez, Vlaovic, Roche, Angulo maybe??? naaa), but don't forget that with the money Valencia made this year from the CL, and with their newly acquired reputation, they won't have problems signing excellent new ones.
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