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The Red Devils were beaten 3-2 by the German side in Las Vegas, making it three defeats on the spin in pre-season.
A notable moment in the friendly came when the new signing from Inter Milan did not seem like a fresh addition to the squad, berating the former captain for a sloppy pass.
The Cameroon international ran out of his goal to shout at Maguire for his decision to play a short pass to Christian Eriksen, which led to a Dortmund chance and Onana making a save.
The 27-year-old says it was perfectly normal to communicate with his teammate in this way, saying that the players have to demand a lot of themselves if they want to be successful.
’I try to talk to them a lot because I know he’s a good player, he is one of the captains of the the team,’ Onana told Manchester United club media of Maguire.
’That’s big and he is good with the ball, so I would demand [from] him a lot and he’s a good, great guy. I have a good relationship with him. I have to be and he has to be ready and I spoke with him because when I’m in the goal, I demand to everyone a lot.
‘I will start with myself because I think we are in this together and mistakes will come. We don’t have to be afraid to make mistakes because this is part of life and we learn from the mistakes.
’So we have to be very critical with ourselves. And if we want to win prizes, we have to demand a lot. And for me, it’s a big honour to be here and I’m very happy to work with these guys, Harry is a top guy and a fantastic player. We will move on.’
Onana added on MUTV: ‘I demand [from] them a lot and I will demand from them a lot because they are great players. Now, for me, it’s a big honour to play with these defenders.
‘With [Lisandro] Martinez, Harry [Maguire] they are doing great things. They are important players for the club. I’m very happy to be part of this team and playing with them is something great.’
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