But Onana is a good choice although I think that the defense in general hasn't been doing very well. I think when you have some weak players, it also makes everyone else less confident.
Manchester united have weak spots, perhaps Erik Ten Hag is working on it. Andre Onana is absolutely a good choice for the Red Devils, his presence is significant for the team. He is new in the club, it's just a matter of time before he fully adapts with Erik Ten Hag pattern of game. Manchester United signed quite some quality players this summer, checking the likes of Mason Mount, Rasmus Højlund and Sofyan Amrabat. These new players are yet to displayed or contribute positively to the team, but the Red Devils supporters have exercised patience as they're keen on watching these players at top level.