You can now search for players and managers eligible for the v3.0.0 carryover process on the official website. This process is planned to take place during the large-scale maintenance in August.
Please check "Player Cards Eligible for Carryover" and "Managers Eligible for Carryover" on the respective webpages.
Head to the website below for more information:

eFootball™ official website > [Game Overview] > [v3.0.0 Carryover Details]