Well Chrysalis, as friends above mentioned, it's an old subject of the forum.
You can find more results like
http://forum.topeleven.com/suggestio...game-chat.html
http://forum.topeleven.com/top-eleve...5Bpoll%5D.html
http://forum.topeleven.com/suggestio...r-friends.html
if you use the advanced search button in the upper right corner and put the key word "chat".

Personally I don't find useful the chat option and I can't imagine that i have to read or delete every day, don't know how many pms could have from my League or other competitions opponents
Indeed in negotiations can be useful so I added that in this more complete thread in Suggestions section here
http://forum.topeleven.com/suggestio...ork-again.html