Amorim, after expressing frustration with management's approach to transfers going into the game at Elland Road, let rip in the aftermath.
"Guys, to stop with that, I noticed that you receive selective information about everything," he snapped. "I came here to be the manager of Manchester United, not to be the coach of Manchester United. And that is clear. I know that my name is not Tuchel, it's not Conte, it's not Mourinho, but I'm the manager of Manchester United.
"And it's going to be like this for 18 months, or when the board decides to change. So that was my point, I want to finish with that. I'm not going to quit. I will do my job until the other guy is coming here to replace me."
Amorim also suggested promises had been broken regarding having the power to shape the culture inside the club.
"I just want to say that I'm going to be the manager of this team, not just the coach," he said. "And I was really clear on that. And that is going to finish in 18 months and then everyone is going to move on. That was the deal.
"That is my job, not to be a coach. If people cannot handle the Gary Neville and the criticism of everything, we need to change the club. No, guys, I just want to say that I came here to be the manager of Manchester United, not to be the coach.
"And every department, the scouting department, the sports director needs to do their job. I will do mine for 18 months and then we move on."