Jose Luis Gaya would be the player i would go all out for next summer. wonderfully gifted wing back at a perfect age for us.
A shout could be made for Coentrao as he is not getting his time at Madrid and has looked solid the handful of times I've seen him play. Rodriguez from Wolfsburg is a player I admire , every time i have seen him he has impressed me defensively ( only watched him last season so cannot comment on current). His ability to defend in 1 vs 1 effectively is a major factor in the modern game , something kolraov and clichy (less so) struggle with.
As much as Kolarov has improved I think next summer would be the right time to move him on. Offensively he's invaluable to us at times but defensively he is sometimes questionable (not knocking him just his style of play).
Ricardo Rodriguez would be an ideal replacement for him. Similar style of player but much younger.
I'd much rather have Rodriguez, three years younger and he's much better going forward. I can't imagine dealing with Wolfsburg again though...Ryan Bertrand is the answer