The midfielder eft Ajax for United last week.
Jongkind told the Manchester Evening News: “He will be challenged, the average age in the Premier League is probably around 26 or 27, but I think he has shown in European campaigns that he has enough skills to play at the highest level.
“He likes a challenge and he has this mindset that he wants to go further every time. I think this is a better time than, for example, [Justin] Kluivert to AS Roma, that was too early.
“It is also a good club to move to. United have a history of bringing in youth players, I think it's a great choice, much better than Real Madrid, I think that would have been a disaster.
“The playing style is more akin to Donny at United than Real Madrid as well."