Ten Hag instructed the players to report to Old Trafford four hours prior to kick-off. They would turn up separately in their personal vehicles and share a pre-match meal at the stadium.
The Dutchman also converted a large hospitality suite at Old Trafford into a pre-match area for his squad.
Nevertheless, Amorim has chosen to abandon that strategy, which means the players will now gather at Carrington, dine together at the training facility and make their way as a collective to Old Trafford.
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United have confirmed they will reach Old Trafford at 2.45pm to take on Arsenal on Sunday.
Speaking to MUTV about the decision, Amorim said: "I always had the feeling that we arrive at Old Trafford and Old Trafford must be the centre of the game, but we cannot spend four hours there waiting for the game.
"And I feel with these facilities [at Carrington] we can be here, preparing for the game away from Old Trafford, and when we arrive at Old Trafford, we have to feel the fans and then go directly to the game, not killing the momentum of the connection with our fans.
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"We know that we have a lot of people waiting there for us, to be with the players and to sign autographs. We will try to do the same.
"So, it's going to be the same experience for the fans. But for us it's going to be better because we are going to feel nearer the game, the momentum with the fans, and we will spend less time in there."
United revealed their £50million revamp of Carrington ahead of the new season earlier this month, funded by part-owner Sir Jim Ratcliffe.
"I have no doubt that it will positively impact the performance of our teams," stated chief executive Omar Berrada during the grand opening.