I think you should be able to track your old players

I always get the feeling when selling a player that i wonder how he will get on at his next club, will he be top goal scorer and so on...

I would like to track my sold players to see how they get on with there career

Anyone else the same?

Would be cool

Yep!
I would want too see my Semedo developing at his new club.
And just to see whether or not the other team is treating him well.

Sometimes when I sell a great player, I send a friend request to the buyer, so that I can see how my old guys get on... but it would be nice, not sure how they would implement it though...