It can be confusing having two different gun owner cards in Illinois, the FOID and the Concealed Carry license. There have been some efforts to combine the cards, but to date they are both required.
If you do not renew your FOID, and your concealed carry license is still valid, your license will be revoked. Therefore it is important to renew your FOID card so you don’t also lose your Concealed Carry License.

Illinois FOID Card