The Red Devils were well beaten by Newcastle United 3-0 at home as they tried to retain the trophy they won last term.
Reguilon, who was on loan at United at the time, was frustrated with his own performance as well.
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Reguilon, now on-loan at Brentford from Tottenham, told The Times: We were defending the title and we were out. I don't care if I am here for six months, I was upset. I don't know how long I was crying like a kid.
Bruno (Fernandes) comes to tell me to relax and I still have the same shit face."
He also added: It's my problem, I am too emotional. I feel everything in football, just like my life. I have to control that more but it's always been part of me, since I was a kid."