Cascarino reckons McTominay has shown all the attributes to play in a deeper role.
“The two midfielders, McTominay, I think McTominay's okay," Cascarino said on talkSPORT.
“Fred and McTominay are not a partnership, they are not a partnership to lead Manchester United in midfield.
“I think [McTominay's] not bad but you're talking about Manchester United being not bad in midfield.
“I don't see Fred at all, I think he's far better than Fred.
“I actually see McTominay as a centre-half. I look at him every time and come away thinking 'you'd be far better off being a centre-half' because he does a lot of things that centre-halves do well."