Arsenal Players Help?

I have £53 million available left, can anyone recommend anyone to buy. (Players marked with a * are players I want to replace, but suggest anyone to replace. (1st Season)

Squad:

GK: Szczesny
RB: Sagna
CB: Mertesacker
CB: Vertonghen (I would have Vermaelen but injured for 64 days)
LB: NO ONE!!! ******
RM: Walcott
CM: Fellaini
CM: Arteta * (Wilshere injured for ages)
LM: Chamberlai
ST: van Persie
ST: Park *

(The LM and RM are more wingers than midfielders)

LB: Lucas Digne, young, fast, very promising.. CM: instead of Arteta, try Isco from Málaga, Fernando Canesin Matos from Standard..or loan Thiago from Barcelona..

And..try to replace Mertesacker with Walter Samuel..he costs in the region of 11 mil..also, in my first season with Man City, Jose Callejon from Madrid was placed on a transfer list and so were Cristian Tello and Isaac Cuenca from Barca.

aly cissokho for LB
Kwadwo Asamoah for CM

don't play 442 with arsenal