Just be like me and forget to set a lineup after you sell some players that were in your lineup and you will lose your cup game real early. That is what happened to me. I wish I had not lost mine so early. I lost to a computerized team that had I even set a lineup, I could have beat on easy. But if I remember correctly, I only had three players in my lineup for that game and it put two lucky fans in the other spots.
But hey, I'm sure you will get your revenge in the rematch. My team has very bad luck every time I promote so I fully expect the same this season