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I hope that Erik ten Hag's purchase of Andre Onana is the best choice and will defend his goal very well, but in reality I think Andre Onana is very bad as a Manchester United goalkeeper and always concedes goals.
And Andre Onana during his time as Manchester United goalkeeper has conceded 12 times in eight matches in the Premier League, and apart from that in two matches in the Champions League he conceded seven times and only kept three clean sheets in all competitions.
And I agree with you, if Manchester United's defense is not good, at least Andre Onana is a hero who should be able to guard his goal very well. But in reality he is not like that and I prefer David de Gea to return to Manchester United.
Give Onana more time to adapt well, he only has 11 games with Manchester United. There are players who immediately fit into their new team and there are those who don't, so let Onana adapt well for his first season and see what he can prove after that.
Ten Hag gives full confidence to Onana to appear in various competitions. Onana's lackluster defense and high self-confidence appeared to cost the team on several occasions, but that is more likely to be changed rather than allowing him to play without the control of his coach. Ten Hag is responsible for his team's performance, so he has to manage everything well.