Perhaps because every expensive player is expected to meet the fans' high expectations, it creates unique pressures for them. De Gea was acquired by Man United for 13 million, while Onana was brought in for over 50 million. From this, fans hope that Onana can outperform De Gea. And we all don't know what kind of pressure haunts expensive players when they struggle to adapt and are forced to perform at their best. You are right; it does take some time for Onana to adjust to the EPL.
What I find significant is the lack of creativity in Man United's defense. Ten Hag's tactics haven't found the right synergy among the players, so the reason for Man United's poor start to the season could be the absence of a strong chemistry between new and old players.
Having just acquired Hojlund, why is Ten Hag rumored to be searching for a new striker again?
Manchester United's performance is far from expectations even though Manchester United recruited several players in the last transfer window but their performance in the Champions League and Premier League is not very good this season. Many internal problems occurred in the Manchester united team which made the players unable to perform optimally in every match. Also several players who suffered injuries at the start of the season also hampered their performance this season. I think manchester united is really under pressure this season, both in the Premier League and the Champions League.
looking at Manchester United performance this season, which has only recorded 4 wins, of course it makes it quite difficult for them to compete in the top 4 in the first half of this season. For Onana, Maybe at the start of this season he won't be able to perform better, But slowly he will get used to it and find his best performance again. Well, Speaking of Erik Ten Hag, glancing at the new stickers, it could be that he thinks the biggest weak point is on the front line.