Speaking to Amazon Prime Sport after the final whistle at Old Trafford on Thursday, Michael Carrick said: "It's not been an easy decision to make to be honest, but I think it's the right one.
"I'm content with my decision — I was meant to take some time off after I finished playing and I promised the family that we'd have some time together.
"100% my decision. Over the last week really [decided to do it], it was creeping in. I respected the club and I respected the new manager coming in, I wanted to make the decision before I had any contact with him or spoke to him.
"I just told the players about five minutes ago. How did they react? They were shocked, a bit surprised, a little bit emotional in the changing room to be honest. I held it together just about."