He had a bad game, doesnt mean he needs to be replaced.
He didnt knock us out single handily, he actually saved a penalty to keep us in. That total team collapse after the Rashford red card played a role in the knock out too. He was very bad in the CL though last year. Cant deny that. He was pretty good the second part of the season. He won us multiple points with his saves this season. He has been our best performing player this season. Hopefully this game is just a one off disaster game. Goalkeepers make mistakes and they can be costly and even more when the team isnt that good and cant make up for his mistake.
Unfortunately we have a goalkeeper that started off badly so fans who wrote him off because of his bad start are now enjoying their 'told you so' moment after Onana shut them up for months. The responses here are so predicatable. He is a very good goalkeeper and will be our goalkeeper for multiple future seasons.