Club Supporter
What is the point of making line-ups offline if you can't use them online? Why do we have to suffer through setting the team up every time we play online? Set it up offline and use it online. If the team contains the original players (no players have been moved to or from other teams) let the offline preset be the online preset. Hard to believe no one has figured that one out.

As for coding it. I assume each player has a unique ID, add them upp and have a control sum. If it matches the original control sum, you are good to go,.

Also, add a fantasy team selection. Move all the crazy good players to one team and then use that team online. Call it Real JawDrop F.C. or similar.