If you, or someone else at your company, was the one to remove the profile from your roster, you can search for the profile and easily reactivate.
To re-add a talent profile:
1. Go to the Talent tab on your account
2. Select the Filter dropdown
3. Under Profile Status, select Former Clients
4. Once you find the profile you'd like to re-add, select the Reactivate Profile button at the bottom of their baseball card
5. A pop-up will appear; select Yes, Reactivate to re-add the talent's profile to your roster
If the talent removed themselves from your roster, you will not be able to reactivate the profile. Talent are able to reactivate these profiles easily.