Unlocked Icons & Heroes disappear as selectable players in career mode.

Hello,

im also missing: Fernando Torres, veron, and kluivert. Why is this ea? And why is it so unclear when and how to unlock heroes. It’s pretty hard to unlock them if you only play career mode and now I wanted to start a new career because I unlocked heroes and now these are gone. What I we fail to unlock a certain icon in a month, will he be forever gone, no more ways to unlock. 
how do I get Fernando Torres, veron, and kluivert icons back???