simply, the game have not enough teams of +1 level than you to complete the CL with 32 teams, and, have to select teams of your level.
Too that means that you are near the top server... and maybe will be good if you buy scouts, wait to the 3rd day of season because your scout list can be a 7* list if you are in a higher league level.... so you can have the oportunity to obtain a player near 8*.... I was 3 seasons in a higher league level with a 7* scout list x3 times... now can be the 4th consecutive...