Onana experienced a significant decline in performance last season, receiving harsh criticism due to Manchester United's poor performance in the backline. One way to prepare for a stronger season is to recruit a new goalkeeper to replace Onana. Several goalkeepers have been targeted by Manchester United in this transfer window, including Diogo Costa.
The biggest mistake, of course, was the blunder of selling De Gea, and to date, there has been no suitable replacement to match De Gea's performance. However, major changes in the transfer market could change everything, meaning Onana will perform even better and be ready to maintain his position as Manchester United's number one goalkeeper.
Manchester United management must do this because fans no longer trust Onana. I'm sure the Manchester United players do, too. Onana has made so many blunders. It's time for Manchester United management to find a new goalkeeper for next season.
It wasn't just selling De Gea, but Ten Hag's numerous other mistakes have led to Manchester United's current slump. Regardless of the past, I believe the future can still be changed, although it will be difficult and take time for Manchester United.