No, like you can do this when setting your lineup. You know how you pick your formation etc. in the menu before you actually press a button to "find an opponent"? Look across the bottom of your screen, I think it's a trigger or bumper for "set player roles" or "team instructions" or whatever. You have as much time as you want in here to change things.
Or maybe we're having a failure to communicate. I know you're talking about Online Seasons, which is what I'm talking about too... Or you're talking about everything that's not online seasons?