Because Ten Hag had a very difficult season at Man United, it was felt that he was considered a bad coach. And especially as Xabi's replacement, it would certainly be considered very bad if he couldn't deliver the best results.
Unfortunately, in this opening match, Ten Hag was actually embarrassed by being defeated by Flamengo U20, even though it was a friendly match.
Source: Full-time in Rio 90+4' | 5-1The defeat to the U-20 team in the preseason match was a very bad start... I thought that after his departure from Man United he would improve, at least a little, but it seems to have gotten worse. What else can we expect from Leverkusen under Erik ten Hag's leadership, he is too monotonous and too confident, he can't even beat the U-20 team, it's just unbelievable.