"Last season, Manchester United didn't concede so many shots," Onana told Sky Sports. "But I don't think it's a big issue because at the end of the day, football is about goals and now we are scoring a lot.
"We'll receive some against us sometimes, but we have defenders that work hard and we will do everything to block the shots. It's the risk we take because we are a very offensive team with the quality we have in front."
Onana continued: "Well, it's quite easy when you're used to playing with the same back four. We are Manchester United, so every player around the first team has the level to belong here.
"Unfortunately, we have a lot of injuries but that is an opportunity for others - like Willy (Kambwala), he was brilliant for us. Of course, when you are used to playing with the same line, it's the best, but at the moment we don't have that. So we just have to deal with the situation, stay positive and look forward."