I think the best offline football management game is Virtuafoot Manager.
Virtuafoot Manager is a free football management game. Recruit your players on the transfer market, create your strategy and manage the daily life of your team. From the player’s training to the financial management of the club, passing by the development of the infrastructures, this game will need you to use your leadership talent to lead your team to the highest level. If you love football, you will love Virtuafoot. You will be able to choose your championship, organize your own cups, visualize your matches lives, etc…
Download on Play Store:
If you’re not okay with Virtual Football Manager, go here: https://solutions.softonic.com/what-are-the-best-offline-soccer-games-for-android
to get more.