Shota Arveladze says Erik ten Hag will bring "something special" to Manchester United but must be given time.
Ten Hag left Ajax to take charge at Old Trafford, succeeding interim boss Ralf Rangnick.
The 52-year-old has been charged with the task of turning around the Red Devils following another disappointing season, which saw Ole Gunnar Solskjaer get the sack.
Former Ajax forward Arveladze - who now coaches Hull City - believes Ten Hag can make a big impact at United, but there will be no quick fix.
"Erik has grown very smart," he said. "[With] his career, he has done really good in choosing his previous teams, his previous works.
"At Bayern Munich, he was head coach of the second team, and then he moved to Utrecht and made a great football team
"Then Ajax, again, he took them to the top level in Europe, winning all the trophies, and now, to England.
"He is very principled. He knows his ideas, his philosophy and he will definitely bring something special there.
"He will need time to do, to show, to explain the way he wants to play [but] I'm quite comfortable with that, that he definitely will succeed."
United have not won a trophy since 2017 and they will not play in the Champions League next season.