The pair had to be separated by Jose Mourinho after they clashed on the training ground.
"I knew he wanted us to give him the ball all the time, but during a game phase I saw him ask for it and I didn't give it to him. I passed it to Paul Pogba.
"Then he started yelling at me, raising his hand, and telling me a lot of things in Spanish and English.
"I said to him: 'What's going on with you, big nose? Shut up'. I knew that if he caught me he would kill me so the only thing for me to do was face him.
"When he entered the locker room, I directly told him to close his mouth and stop yelling.
"We started to insult each other, and all our team-mates were watching us.
"And in the middle, Jose Mourinho was trying to calm us down."