So I decided to make a post on players whom your team shouldn't have let go of. I anticipate a pretty long list from an Arsenal fan! xD

Here's mine:

Ronaldinho
Henry
Eto'o
Deco
Bojan 
Toure
Milito

....

you guys?

Ballack
Drogba
Deco

Seriously? Is that it? LOL you should do a loan one

@rama: ... really dude? You think it was a mistake to sell Ronaldinho and Deco, and thus usher in the greatest period of success the club has ever had?

Etoo Definitely

ohhh and Zlatan, his price was too low for Ac Milan. Oleguer lol im joiking.

...not zlatan for me.... didn't fit in well!

Alex Song
Carlos Vela
Samir Nasri
Gael Clichy
Cesc Fabregas
Robert Pires
Thierry Henry
Gilberto Silva
Marc Overmars
Ashley Cole
Patrick Vieira
Emmanuel Eboue
Kolo Toure
Emmanuel Adebayor
Aleksandr Hleb

^^

...RVP? >.<

LOL where is Van Persie?

I don't see RVP as a player which shouldn't our team let go, sorry. I'm grateful that he carried us last season yes but I don't see him in that way.

David Villa
David Silva
Juan Mata
Jordi Alba
Isco
Joaquin
Vicente

I know this is off topic, but imagaine Southampton with:

Bale
Walcott
Chamberlain
Dyer

etc.

Bale would have never developed into the player he became withour Harry and Spurs.

Wesley Sneijder
Arjen Robben
Claude Makelele
Sergio Canales
Roberto Soldado
Diego Lopez (10 times better than Adan)
Antonio Cassano

...and there's plenty more, but I just can't think of them at the moment.

too lazy to get started on Ajax

David Villa
David Silva
Juan Mata
Jordi Alba
Isco
Joaquin
Vicente

I have to strongly disagree 

Alba is no loss in my eyes. Once all true valencianistas saw who he really was we regretted having him in our team..

Vicente was long past his best-before-date when we sold him.

Joaquin hadn't been that good in valencia so we sold him to malaga.

however i would like to add Aduriz to the list

@Knibis I rather judge a player by what he brings to the team more than what he said. He's a too left back and frankly we need one. Guardado is a makeshift LB and Alba and Mathieu had a really good partnership playing LM and LB swapping out. 

Vicente was great. He had a couple more seasons left to give so did Joaquin. They brought a lot to our attack. 

of all time : i think R9 phenomeno and Maradona sold at this time due to lack of money...

KAGAWA SHINJI!!! 

Ballack
Drogba
Deco
Joe Cole
Lampard (its comiing)