The game should put you on a match vs someone the same level for this "super cup" to work. I was thinking about this competition earlier in the season where all winners of leagues/cups/champions league win super cup invitations and you play someone random on the same level as you that also won a trophy last season, it could work.
Match should be played on Day 2 of the season at a neutral venue so theres a day in advance to prepare your squad.