The Scotland midfielder is now thriving in Italy, where he was the key player in Napoli's title triumph last season.
Speaking on the Overlap, former United captain stated: "What’s happened to Scott McTominay? Have we made a massive mistake?”
Ex-Liverpool defender Carragher replied: “You’ve killed another Man United player, that’s what happened. Too much criticism, (saying) he’s not good enough.”
Arsenal legend Ian Wright then added: “I remember Gary saying they’ve got to get rid of him. Poor Scott. He just wanted some freedom.”
Neville then insisted: “I didn’t say he wasn’t good enough… Not me. Seriously I never thought they should have got rid of him. I always said at the time, he’s a squad player, in the 15 or 16. He should never have been got rid of.”
However, in the past, Neville has claimed: “McTominay, when I watch him, I’m not sure he’s actually good enough on the ball to be a Man United midfield player.
“He’s a big lad. Is he sharp enough on the ball to be a Man United central midfield player?”