Speaking on the No Tippy Tappy Football podcast, the 61-year-old said: "In my opinion, and can I say this from a position of total humility that he's manager of Manchester United, who am I? Who am I to tell him what to do? But in my stomach, it feels like you don't have to play 5-4-1, whatever you want to call it. You don't have to do it. If the group of players is screaming at you to play a three-man midfield to protect the mobility of a Casemiro, if you want to play him or whoever it might be.
"You maybe have to put an extra man in there, so why would you be so stuck on one system and trying to force Amad as a right wing-back? Amad who's a brilliant footballer, Man United class I would suggest. I speak to Gary Pallister a lot about this when we sit and have coffee near my street most days. Amad, he's a genius."
Mowbray added: "I talked about not having to look at the ball, the ball's stuck to his left foot. He is a brilliant football player, and a brilliant human being. And you're playing him at right wing-back just to fit into your system. He should be bending it in the top corner with his left foot, he should be sitting people on their backside and scoring wonderful goals like I know he can. Why's he chasing people into his own box playing right wing-back?"