If you purchase FIFA 21 for PlayStation 4 or Xbox One, you’ll be able to upgrade your copy once you have the corresponding next generation console (PlayStation 4 to PlayStation 5, or Xbox One to Xbox Series X) at no extra cost by downloading it to your console up until the launch of FIFA 22.
If you buy a physical copy of FIFA 21 on PlayStation 4 or Xbox One, you’ll be able to download and play FIFA 21 on PlayStation 5 or Xbox Series X from the PlayStation Store or Microsoft Store at no extra cost once the game releases. You’ll need your FIFA 21 disc in the tray to play FIFA 21 on PlayStation 5 as physical discs cannot currently be used to upgrade to discless consoles.
If you buy a digital copy of FIFA 21 on PlayStation 4 or Xbox One, your copy of FIFA 21 on PlayStation 5 or Xbox Series X will be bundled with the PlayStation 4 or Xbox One copy, and you’ll be able to download and play FIFA 21 from the PlayStation Store or Microsoft Store at no extra cost once it releases later this year.
https://www.ea.com/games/fifa/fifa-21/news/fifa-21-dual-entitlement-info-faq