Ten Hag is a complete idiot. I'm sorry, but he has been since he went to United," he told talkSPORT.
"He's now talking gibberish about Harry Potter."
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Morgan then criticised the manager's methods for handling star players.
Cristiano Ronaldo spoke with the 59-year-old broadcaster in the notoriously explosive interview that took place prior to the Portuguese leaving United in November 2022 for Saudi Pro League side Al Nassr.
Two weeks ago, Jadon Sancho completed a loan move - with an obligation to buy - to Chelsea after falling out with the Dutch coach.
"Ten Hag is everything Ronaldo said he was in that interview that led him to leave United," Morgan said.
Ten Hag is like that bossy little school teacher who doesn't know how to handle supreme academic talent, you know?
It's all top players he hasn't been able to handle at United, Cristiano Ronaldo, Jadon Sancho, Marcus Rashford, etc.
He can handle lesser players, he can handle the Ajax players who have never been on the big stage before, but he cannot handle top players.
United have gotten worse than they were last season, and there are only two chances for them to make it into the top four this season - no hope or Bob Hope, and Bob Hope has been dead 20 years."