Recently, Van der Sar was asked about Onana's performance at Manchester United. He believes Onana will perform well next season.
Van der Sar said: "I have known Onana for a long time. He has been in Ajax for four or five years. I have trained with him and watched him grow step by step. He has many advantages, is flexible, is quick to react, and has good skills under his feet. I believe he will overcome the current difficulties."
"It's not easy, sometimes your performance or pressure will be great, but I've seen his performance in Ajax, Inter Milan and the Champions League finals, and I believe he will perform well next season."
For Manchester United, Van der Sar said: "I think there are still many places for Manchester United to improve to see if we can find better players, different players, but I don't think the goalkeeper needs to be solved now."
} When asked if he thought the criticism of Onana was unfair, Van der Sar said: "If you make a mistake, or let the ball pass between your legs, or you make a mistake in the backcourt, you can blame the goalkeeper. Onana's performance this year is indeed unstable, but he still has the strength, so he should be able to continue playing for Manchester United next season."
Regarding Manchester United's overall performance, Van der Sar said: "I think it's a disappointing season. Manchester United has not reached its level in several years. Some other clubs have improved, and even some small clubs have done a good job and are difficult to deal with. So it's a very bad season, especially when losing to Tottenham in the Europa League final, without any struggle."