It's embarrassing for a big squad like Bayer Leverkusen to suffer from such a terrible defeat at the hands of Flamengo U20. After the outcome of the game, I started having doubts if Erik Ten Hag is capable enough to lead Bayer Leverkusen ahead of the German Bundesliga season.
Isn't most of the line-ups U20 for Leverkusen too? Eh, I don't know, I wouldn't put too much into one game of pre-season. I remember seeing other clubs perform terribly at friendly games, but can win games comfortably when the season starts. He may be experimenting with the squad to see which player can do this or that. No harm's done even if they lost 20-0 anyway, especially if the players understand the goal of the match is to try and practice new tactics.