United meet the Sky Blues at Wembley this Sunday.
Onana told manutd.com: It's very exciting.
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But as I've always said: playing for this beautiful club, you must win. It's a semi-final of course; we are going there to win.
It's a very good opponent and this game is going to be tough, but we are Manchester United so we must be there ready for them."
He added, Manchester? It's a nice city, people are nice here," he said. I feel welcome here; people treat me very good here. Of course, I was in Milan last season and the season before I was in Amsterdam. I had a great time there, and we achieved a lot of big things together, but I'm very happy to be here."