Speaking to Zero Zero, McCarthy said: "He lacks a bit of that fire, that passion. That's where we differ, him and I. I think that was one of the difficulties that the team and the players encountered. Before I joined the team, I always had to communicate my thoughts to the head coach, which is normal. For someone like me, with strong convictions, it’s not easy. Erik always had the final say."
McCarthy also opened up on Ronaldo's return to Man Utd and believes Ten Hag wasted his time back with the Red Devils.
He added: "If we work as a team and then let Cristiano do what he needs to do in his position, because he is the best in the world at it, that is ideal. I think Manchester United wasted a great opportunity to use Cristiano in the right way. But I was not the head coach and I could not be the one to make those decisions."