Playing Football Manager in a Steam's Offline Mode has changed. Here's the proper way to stop your game asking to connect back online.
Football Manager will need Internet access for its activation process because Steam is a network-based platform.
Football Manager players that do not want Steam to connect to the Internet can launch the Steam client in ‘Offline Mode’, after Football Manager installation.
Game will require internet access only to apply game updates or Steam's, or playing network games or use any of the uploading features to Steam's Workshop, that are in Football Manager.
Play Football Manager in Steam's Offline Mode, please follow these instructions:
‘Go Online’ Again
If you would like to reconnect Steam to the Internet in the future to download game updates, activate new products or play multiplayer modes on your games, please select ‘Go Online’ from the top left ‘Steam’ menu.